The **ancient Roman units of measurement** were primarily founded on the Hellenic system, which in turn was influenced by the Egyptian and the Mesopotamian system.^{[ citation needed ]} The Roman units were comparatively consistent and well documented.

The basic unit of Roman linear measurement was the * pes* or

Source | Reported value in English feet | Metric equivalent |
---|---|---|

Foot on the statue of Cossutius | 0.967 | 295 mm |

Foot on the monument of Statilius | 0.972 | 296 mm |

Foot of Villalpandus, derived from Congius of Vespasian | 0.986 | 301 mm |

Smith (1851) gives a value of 0.9708 English feet, or about 295.9 mm.^{ [2] } An accepted modern value is 296 mm.^{ [3] }

The Roman foot was sub-divided either like the Greek *pous* into 16 *digiti* or fingers; or into 12 *unciae* or inches. Frontinus writes in the 1st century AD that the *digitus* was used in Campania and most parts of Italy.^{ [4] } The principal Roman units of length were:

Roman unit | English name | Equal to | Metric equivalent | Imperial equivalent | Notes |
---|---|---|---|---|---|

digitus | finger | 1⁄16 pes | 18.5 mm | 0.728 in 0.0607 ft | |

uncia pollex | inch thumb | 1⁄12 pes | 24.6 mm | 0.971 in 0.0809 ft | |

palmus | palm | 1⁄4 pes | 74 mm | 0.243 ft | |

palmus maior | palm length (lit."greater palm") | 3⁄4 pes | 222 mm | 0.728 ft | in late times |

pes (plural: pedes) | (Roman) foot | 1 pes | 296 mm | 0.971 ft | |

palmipes | foot and a palm | 1+1⁄4 pedes | 370 mm | 1.214 ft | |

cubitum | cubit | 1+1⁄2 pedes | 444 mm | 1.456 ft | |

gradus pes sestertius | step | 2+1⁄2 pedes | 0.74 m | 2.427 ft | |

passus | pace | 5 pedes | 1.48 m | 4.854 ft | |

decempeda pertica | perch | 10 pedes | 2.96 m | 9.708 ft | |

actus (length) | 120 pedes | 35.5 m | 116.496 ft | 24 passus or 12 decembeda | |

stadium | stade | 625 pedes | 185 m | 607.14 ft | 600 Greek feet or 125 passus or 1⁄8 mille ^{ [5] } |

mille passus mille passuum | (Roman) mile | 5,000 pedes | 1.48 km | 4,854 ft 0.919 mi | 1000 passus or 8 stadia |

leuga leuca | (Gallic) league | 7,500 pedes | 2.22 km | 7,281 ft 1.379 mi | |

Except where noted, based on Smith (1851).^{ [2] } English and metric equivalents are approximate, converted at 1 pes = 0.9708 English feet and 296 mm respectively. | |||||

Other units include the schoenus (from the Greek for "rush rope") used for the distances in Isidore of Charax's * Parthian Stations * (where it had a value around 5 km or 3 miles)^{ [6] }^{ [7] } and in the name of the Nubian land of Triacontaschoenus between the First and Second Cataracts on the Nile (where it had a value closer to 10.5 km or 6+1⁄2 miles).^{ [8] }^{ [9] }

The ordinary units of measurement of area were:

Roman unit | English name | Equal to | Metric equivalent | Imperial equivalent | Description |
---|---|---|---|---|---|

pes quadratus | square foot | 1 pes qu. | 0.0876 m^{2} | 0.943 sq ft | |

scrupulum or decempeda quadrata | 100 pedes qu. | 8.76 m^{2} | 94.3 sq ft | the square of the standard 10-foot measuring rod | |

actus simplex | 480 pedes qu. | 42.1 m^{2} | 453 sq ft | 4 × 120 pedes^{ [10] } | |

uncia | 2,400 pedes qu. | 210 m^{2} | 2,260 sq ft | ||

clima | 3,600 pedes qu. | 315 m^{2} | 3,390 sq ft | 60 × 60 pedes^{ [10] } | |

actus quadratus or acnua | 14,400 pedes qu. | 1,262 m^{2} | 13,600 sq ft | also called arpennis in Gaul ^{ [10] } | |

jugerum | 28,800 pedes qu. | 2,523 m^{2} | 27,200 sq ft 0.623 acres | ||

heredium | 2 jugera | 5,047 m^{2} | 54,300 sq ft 1.248 acres | ||

centuria | 200 jugera | 50.5 ha | 125 acres | formerly 100 jugera^{ [10] } | |

saltus | 800 jugera | 201.9 ha | 499 acres | ||

modius | 16 ha | 40 acres | Medieval Latin, plural modii^{ [11] } | ||

Except where noted, based on Smith (1851).^{ [2] } Metric equivalents are approximate, converted at 1 pes = 296 mm. | |||||

Other units of area described by Columella in his *De Re Rustica* include the *porca* of 180 × 30 Roman feet (about 473 m^{2} or 5,090 sq ft) used in Hispania Baetica and the Gallic *candetum* or *cadetum* of 100 feet^{[ clarification needed ]} in the city or 150 in the country. Columella also gives uncial divisions of the *jugerum*, tabulated by the anonymous translator of the 1745 Millar edition as follows:

Roman unit | Roman square feet | Fraction of jugerum | Metric equivalent | Imperial equivalent | Description |
---|---|---|---|---|---|

dimidium scrupulum | 50 | 1⁄576 | 4.38 m^{2} | 47.1 sq ft | |

scrupulum | 100 | 1⁄288 | 8.76 m^{2} | 94.3 sq ft | |

duo scrupula | 200 | 1⁄144 | 17.5 m^{2} | 188 sq ft | |

sextula | 400 | 1⁄72 | 35.0 m^{2} | 377 sq ft | |

sicilicus | 600 | 1⁄48 | 52.6 m^{2} | 566 sq ft | |

semiuncia | 1,200 | 1⁄24 | 105 m^{2} | 1,130 sq ft | |

uncia | 2,400 | 1⁄12 | 210 m^{2} | 2,260 sq ft | |

sextans | 4,800 | 1⁄6 | 421 m^{2} | 4,530 sq ft | |

quadrans | 7,200 | 1⁄4 | 631 m^{2} | 6,790 sq ft | |

triens | 9,600 | 1⁄3 | 841 m^{2} | 9,050 sq ft | |

quincunx | 12,000 | 5⁄12 | 1,051 m^{2} | 11,310 sq ft | |

semis | 14,400 | 1⁄2 | 1,262 m^{2} | 15,380 sq ft | = actus quadratus^{ [2] } |

septunx | 16,800 | 7⁄12 | 1,472 m^{2} | 15,840 sq ft | |

bes | 19,200 | 2⁄3 | 1,682 m^{2} | 18,100 sq ft | |

dodrans | 21,600 | 3⁄4 | 1,893 m^{2} | 20,380 sq ft | |

dextans | 24,000 | 5⁄6 | 2,103 m^{2} | 22,640 sq ft | |

deunx | 26,400 | 11⁄12 | 2,313 m^{2} | 24,900 sq ft | |

jugerum | 28,800 | 1 | 2,523 m^{2} | 27,160 sq ft | |

Except where noted, based on Millar (1745).^{ [10] } Metric equivalents are approximate, converted at 1 pes = 296 mm. |

Both liquid and dry volume measurements were based on the sextarius. The sextarius was defined as 1⁄48 of a cubic foot, known as an amphora quadrantal. Using the value 296 mm (11.7 in) for the Roman foot, an amphora quadrantal can be computed at approximately 25.9 L (6.8 US gal), so a sextarius (by the same method) would theoretically measure 540.3 ml (19.02 imp fl oz; 18.27 US fl oz), which is about 95% of an imperial pint (568.26125 ml).

Archaeologically, however, the evidence is not as precise. No two surviving vessels measure an identical volume, and scholarly opinion on the actual volume ranges between 500 ml (17 US fl oz)^{ [12] } and 580 ml (20 US fl oz).^{ [13] }

The core volume units are:

*amphora quadrantal*(Roman jar) – one cubic*pes*(Roman foot)*congius*– a half-*pes*cube (thus 1⁄8*amphora quadrantal*)*sextarius*– literally 1⁄6 of a*congius*

Roman unit | Equal to | Metric | Imperial | US fluid |
---|---|---|---|---|

ligula | 1⁄288 congius | 11.4 mL | 0.401 fl oz | 0.385 fl oz |

cyathus | 1⁄72 congius | 45 mL | 1.58 fl oz | 1.52 fl oz |

acetabulum | 1⁄48 congius | 68 mL | 2.39 fl oz | 2.30 fl oz |

quartarius | 1⁄24 congius | 136 mL | 4.79 fl oz | 4.61 fl oz |

hemina or cotyla | 1⁄12 congius | 273 mL | 9.61 fl oz | 9.23 fl oz |

sextarius | 1⁄6 congius | 546 mL | 19.22 fl oz 0.961 pt | 18.47 fl oz 1.153 pt |

congius | 1 congius | 3.27 L | 5.75 pt 0.719 gal | 3.46 qt 0.864 gal |

urna | 4 congii | 13.1 L | 2.88 gal | 3.46 gal |

amphora quadrantal | 8 congii | 26.2 L | 5.76 gal | 6.92 gal |

culeus | 160 congii | 524 L | 115.3 gal | 138.4 gal |

Except where noted, based on Smith (1851).^{ [2] }Modern equivalents are approximate. |

Roman unit | Equal to | Metric | Imperial | US dry |
---|---|---|---|---|

ligula | 1⁄288 congius | 11.4 ml | 0.401 fl oz | 0.0207 pt |

cyathus | 1⁄72 congius | 45 ml | 1.58 fl oz | 0.082 pt |

acetabulum | 1⁄48 congius | 68 ml | 2.39 fl oz | 0.124 pt |

quartarius | 1⁄24 congius | 136 ml | 4.79 fl oz | 0.247 pt |

hemina or cotyla | 1⁄12 congius | 273 ml | 9.61 fl oz | 0.496 pt |

sextarius | 1⁄6 congius | 546 ml | 19.22 fl oz 0.961 pt | 0.991 pt |

semimodius | 1+1⁄3 congii | 4.36 L | 0.96 gal | 0.99 gal |

modius | 2+2⁄3 congii | 8.73 L | 1.92 gal | 1.98 gal |

modius castrensis | 4 congii | 12.93 L^{ [14] } | 2.84 gal | 2.94 gal |

Except where noted, based on Smith (1851).^{ [2] }Modern equivalents are approximate. |

The units of weight or mass were mostly based on factors of 12. Several of the unit names were also the names of coins during the Roman Republic and had the same fractional value of a larger base unit: libra for weight and as for coin. Modern estimates of the libra range from 322 to 329 g (11.4 to 11.6 oz) with 5076 grains or 328.9 g (11.60 oz) an accepted figure.^{ [3] }^{ [13] }^{ [15] } The *as* was reduced from 12 ounces to 2 after the First Punic War, to 1 during the Second Punic War, and to half an ounce by the 131 BC Lex Papiria.^{ [16] }^{ [17] }

The divisions of the libra were:

Roman unit | English name | Equal to | Metric equivalent | Imperial equivalent | Description |
---|---|---|---|---|---|

uncia | Roman ounce | 1⁄12 libra | 27.4 g | 0.967 oz | lit. "a twelfth"^{ [18] } |

sescuncia or sescunx | 1⁄8 libra | 41.1 g | 1.45 oz | lit. "one and one-half twelfths" | |

sextans | 1⁄6 libra | 54.8 g | 1.93 oz | lit. "a sixth" | |

quadrans teruncius | 1⁄4 libra | 82.2 g | 2.90 oz | lit. "a fourth" lit. "triple twelfth" | |

triens | 1⁄3 libra | 109.6 g | 3.87 oz | lit. "a third" | |

quincunx | 5⁄12 libra | 137.0 g | 4.83 oz | lit. "five-twelfths"^{ [19] } | |

semis or semissis | 1⁄2 libra | 164.5 g | 5.80 oz | lit. "a half" | |

septunx | 7⁄12 libra | 191.9 g | 6.77 oz | lit. "seven-twelfths" | |

bes or bessis | 2⁄3 libra | 219.3 g | 7.74 oz | lit. "two [parts] of an as" | |

dodrans | 3⁄4 libra | 246.7 g | 8.70 oz | lit. "less a fourth" | |

dextans | 5⁄6 libra | 274.1 g | 9.67 oz | lit. "less a sixth" | |

deunx | 11⁄12 libra | 301.5 g | 10.64 oz | lit. "less a twelfth" | |

libra | Roman pound libra ^{ [20] } | 328.9 g | 11.60 oz 0.725 lb | lit. "balance"^{ [20] } | |

Except where noted, based on Smith (1851).^{ [2] } Metric equivalents are approximate, converted at 1 libra = 328.9 g . | |||||

The subdivisions of the uncia were:

Roman unit | English name | Equal to | Metric equivalent | Imperial equivalent | Description |
---|---|---|---|---|---|

siliqua | carat | 1⁄144 uncia | 0.19 g | 2.9 gr 0.0067 oz | lit. "carob seed" The Greek κεράτιον ( kerátion) |

obolus | obolus^{ [21] } | 1⁄48 uncia | 0.57 g | 8.8 gr 0.020 oz | lit. "obol", from the Greek word for "metal spit"^{ [21] } |

scrupulum | scruple ^{ [22] } | 1⁄24 uncia | 1.14 g | 17.6 gr 0.040 oz | lit. "small pebble"^{ [22] } |

semisextula dimidia sextula | 1⁄12 uncia | 2.28 g | 35.2 gr 0.080 oz | lit. "half-sixth", "little sixth" | |

sextula | sextula^{ [23] } | 1⁄6 uncia | 4.57 g | 70.5 gr 0.161 oz | lit. "little sixth"^{ [23] } |

sicilicus siciliquus | 1⁄4 uncia | 6.85 g | 106 gr 0.242 oz | lit. "little sickle" | |

duella | 1⁄3 uncia | 9.14 g | 141 gr 0.322 oz | lit. "little double [sixths]" | |

semuncia | half-ounce semuncia ^{ [24] } | 1⁄2 uncia | 13.7 g | 211 gr 0.483 oz | lit. "half-twelfth"^{ [24] } |

uncia | Roman ounce | 27.4 g | 423 gr 0.967 oz | Derived from unus, "one," in the sense of "single unit of weight."^{ [25] } | |

Except where noted, based on Smith (1851).^{ [2] } Metric equivalents are approximate, converted at 1 libra = 328.9 g . | |||||

The complicated Roman calendar was replaced by the Julian calendar in 45 BC.^{ [26] } In the Julian calendar, an ordinary year is 365 days long, and a leap year is 366 days long. Between 45 BC and AD 1, leap years occurred at irregular intervals. Starting in AD 4, leap years occurred regularly every four years. Year numbers were rarely used; rather, the year was specified by naming the Roman consuls for that year. (As consuls' terms latterly ran from January to December, this eventually caused January, rather than March, to be considered the start of the year.) When a year number was required, the Greek Olympiads were used, or the count of years since the founding of Rome, "ab urbe condita" in 753 BC. In the Middle Ages, the year numbering was changed to the Anno Domini count.

The calendar used in most of the modern world, the Gregorian calendar, differs from the Julian calendar in that it skips three leap years every four centuries to more closely approximate the length of the tropical year.

The Romans grouped days into an eight-day cycle called the * nundinae *, with every eighth day being a market day.

Independent of the *nundinae*, astrologers kept a seven-day cycle called a * hebdomas * where each day corresponded to one of the seven classical planets, with the first day of the week being Saturn-day, followed by Sun-day, Moon-day, Mars-day, Mercury-day, Jupiter-day, and lastly Venus-day. Each astrological day was reckoned to begin at sunrise. The Jews also use a seven-day week, which began Saturday evening. The seventh day of the week they called Sabbath; the other days they numbered rather than named, except for Friday, which could be called either the Parasceve or the sixth day. Each Jewish day begins at sunset. Christians followed the Jewish seven-day week, except that they commonly called the first day of the week the *Dominica*, or the Lord's day. In 321, Constantine the Great gave his subjects every Sunday off in honor of his family's tutelary deity, the Unconquered Sun, thus cementing the seven-day week into Roman civil society.

The Romans divided the daytime into twelve *horae* or hours starting at sunrise and ending at sunset. The night was divided into four watches. The duration of these hours varied with seasons; in the winter, when the daylight period was shorter, its 12 hours were correspondingly shorter and its four watches were correspondingly longer.

Astrologers divided the solar day into 24 equal hours, and these astrological hours became the basis for medieval clocks and our modern 24-hour mean solar day.

Although the division of hours into minutes and seconds did not occur until the Middle Ages, Classical astrologers had a *minuta* equal to 1⁄60 of a day (24 modern minutes), a *secunda* equal to 1⁄3600 of a day (24 modern seconds), and a *tertia* equal to 1⁄216,000 of a day (0.4 modern seconds).

A number of special symbols for Roman currency were added to the Unicode Standard version 5.1 (April 2008) as the Ancient Symbols block (U+10190–U+101CF, in the Supplementary Multilingual Plane ).

Ancient Symbols ^{ [1] }^{ [2] }Official Unicode Consortium code chart (PDF) | ||||||||||||||||

0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | A | B | C | D | E | F | |

U+1019x | 𐆐 | 𐆑 | 𐆒 | 𐆓 | 𐆔 | 𐆕 | 𐆖 | 𐆗 | 𐆘 | 𐆙 | 𐆚 | 𐆛 | 𐆜 | |||

U+101Ax | 𐆠 | |||||||||||||||

U+101Bx | ||||||||||||||||

U+101Cx | ||||||||||||||||

Notes |

As mentioned above, the names for divisions of an *as* coin (originally one libra of bronze) were also used for divisions of a libra, and the symbols U+10190–U+10195 are likewise also symbols for weights:

**U+10190 (𐆐):**Sextans**U+10191 (𐆑):**Uncia**U+10192 (𐆒):**Semuncia**U+10193 (𐆓):**Sextula**U+10194 (𐆔):**Semisextula**U+10195 (𐆕):**Siliqua

The **inch** is a unit of length in the British imperial and the United States customary systems of measurement. It is equal to 1/36 yard or 1/12 of a foot. Derived from the Roman uncia ("twelfth"), the word *inch* is also sometimes used to translate similar units in other measurement systems, usually understood as deriving from the width of the human thumb.

The **mile**, sometimes the **international mile** or **statute mile** to distinguish it from other miles, is a British imperial unit and United States customary unit of distance; both are based on the older English unit of length equal to 5,280 English feet, or 1,760 yards. The statute mile was standardised between the British Commonwealth and the United States by an international agreement in 1959, when it was formally redefined with respect to SI units as exactly 1,609.344 metres.

The **pound** or **pound-mass** is a unit of mass used in British imperial and United States customary systems of measurement. Various definitions have been used; the most common today is the international avoirdupois pound, which is legally defined as exactly 0.45359237 kilograms, and which is divided into 16 avoirdupois ounces. The international standard symbol for the avoirdupois pound is **lb**; an alternative symbol is **lb _{m}**,

**Biblical and Talmudic units of measurement** were used primarily by ancient Israelites and appear frequently within the Hebrew Bible as well as in later rabbinic writings, such as the Mishnah and Talmud. These units of measurement continue to be used in functions regulating Jewish contemporary life. The specificity of some of the units used and which are encompassed under these systems of measurement have given rise, in some instances, to disputes, owing to the discontinuation of their Hebrew names and their replacement by other names in modern usage.

The **gram** is a unit of mass in the International System of Units (SI) equal to one one thousandth of a kilogram.

The **ounce** is any of several different units of mass, weight or volume and is derived almost unchanged from the *uncia*, an Ancient Roman unit of measurement.

The **dram** is a unit of mass in the avoirdupois system, and both a unit of mass and a unit of volume in the apothecaries' system. It was originally both a coin and a weight in ancient Greece. The unit of volume is more correctly called a **fluid dram**, **fluid drachm**, **fluidram** or **fluidrachm**.

The **talent** was a unit of weight used in the ancient world, often used for weighing gold and silver, but also mentioned in connection with other metals, ivory, and frankincense. In Homer's poems, it is always used of gold and is thought to have been quite a small weight of about 8.5 grams (0.30 oz), approximately the same as the later gold stater coin or Persian daric.

The **apothecaries' system**, or **apothecaries' weights and measures**, is a historical system of mass and volume units that were used by physicians and apothecaries for medical prescriptions and also sometimes by scientists. The English version of the system is closely related to the English troy system of weights, the pound and grain being exactly the same in both. It divides a pound into 12 ounces, an ounce into 8 drachms, and a drachm into 3 scruples of 20 grains each. This exact form of the system was used in the United Kingdom; in some of its former colonies, it survived well into the 20th century. The apothecaries' system of measures is a similar system of volume units based on the fluid ounce. For a long time, medical recipes were written in Latin, often using special symbols to denote weights and measures.

The **palm** is an obsolete anthropic unit of length, originally based on the width of the human palm and then variously standardized. The same name is also used for a second, rather larger unit based on the length of the human hand.

The **Attic talent**, also known as the **Athenian talent** or **Greek talent**, is an ancient unit of weight equal to about 26 kilograms (57 lb), as well as a unit of value equal to this amount of pure silver. A talent was originally intended to be the mass of water required to fill an amphora, about one cubic foot (28 L).

The **mina** is an ancient Near Eastern unit of weight, roughly equivalent to a pound, which was divided into 60 shekels. The mina, like the shekel, was also a unit of currency.

An **amphora** (/ˈæmfərə/; Ancient Greek: ἀμφορεύς was the unit of measurement of volume in the Greco-Roman era. The term *amphora* comes from ancient Greece where people used a tall jar looking container with two opposed handles near the top mostly made of ceramic. Amphora literally means "two handled".

**English units** are the units of measurement used in England up to 1826, which evolved as a combination of the Anglo-Saxon and Roman systems of units. Various standards have applied to English units at different times, in different places, and for different applications.

The **ancient Egyptian units of measurement** are those used by the dynasties of ancient Egypt prior to its incorporation in the Roman Empire and general adoption of Roman, Greek, and Byzantine units of measurement. The units of length seem to have originally been anthropic, based on various parts of the human body, although these were standardized using cubit rods, strands of rope, and official measures maintained at some temples.

**Ancient Greek units of measurement** varied according to location and epoch. Systems of ancient weights and measures evolved as needs changed; Solon and other lawgivers also reformed them *en bloc*. Some units of measurement were found to be convenient for trade within the Mediterranean region and these units became increasingly common to different city states. The calibration and use of measuring devices became more sophisticated. By about 500 BC, Athens had a central depository of official weights and measures, the *Tholos*, where merchants were required to test their measuring devices against official standards.

The earliest recorded systems of weights and measures originate in the 3rd or 4th millennium BC. Even the very earliest civilizations needed measurement for purposes of agriculture, construction and trade. Early standard units might only have applied to a single community or small region, with every area developing its own standards for lengths, areas, volumes and masses. Often such systems were closely tied to one field of use, so that volume measures used, for example, for dry grains were unrelated to those for liquids, with neither bearing any particular relationship to units of length used for measuring cloth or land. With development of manufacturing technologies, and the growing importance of trade between communities and ultimately across the Earth, standardized weights and measures became critical. Starting in the 18th century, modernized, simplified and uniform systems of weights and measures were developed, with the fundamental units defined by ever more precise methods in the science of metrology. The discovery and application of electricity was one factor motivating the development of standardized internationally applicable units.

In Ancient Roman measurement, the **acetabulum** was a measure of volume equivalent to the Greek ὀξύβαφον (*oxybaphon*). It was one-fourth of the hemina and therefore one-eighth of the sextarius. It contained the weight in water of fifteen Attic drachmae.

In Ancient Roman measurement, * congius* was a liquid measure that was about 3.48 litres. It was equal to the larger chous of the Ancient Greeks. The congius contained six

- ↑ Greaves, John (1647)
*A discourse of the Romane foot and denarius; from whence, as from two principles, the measures and weights used by the ancients may be deduced*London: William Lee - 1 2 3 4 5 6 7 8 Smith, Sir William; Charles Anthon (1851)
*A new classical dictionary of Greek and Roman biography, mythology, and geography partly based upon the Dictionary of Greek and Roman biography and mythology*New York: Harper & Bros. Tables, pp. 1024–1030 - 1 2 Hosch, William L. (ed.) (2010)
*The Britannica Guide to Numbers and Measurement*New York: Britannica Educational Publications, 1st edition. ISBN 978-1-61530-108-9, p. 206 - ↑ Sextus Julius Frontinus (c. 100 AD)
*De aquis***1**:24. English translation. - ↑ Equivalent to the English cable (600 feet) or furlong (1⁄8 mile)
- ↑ Edwell, Peter (2007).
*Between Rome and Persia: The Middle Euphrates, Mesopotamia and Palmyra Under Roman Control*. Routledge. p. 228. ISBN 9781134095735. - ↑ Bell, Gertrude; Mason, Fergus (2014).
*Amurath to Amurath: Includes Biography of Gertrude Bell*. BookCaps Study Guides. p. 105. ISBN 9781629172859. - ↑ Herodotus (1998).
*The Histories*. OUP Oxford. p. 592. ISBN 9780191589553. - ↑ Fage, J. D. (1979).
*The Cambridge History of Africa*. Cambridge University Press. p. 258. ISBN 9780521215923. - 1 2 3 4 5 Lucius Junius Moderatus Columella, Anon. (trans.) (1745)
*L. Junius Moderatus Columella of Husbandry, in Twelve Books: and his book, concerning Trees. Translated into English, with illustrations from Pliny, Cato, Varro, Palladius and other ancient and modern authors*London: A. Millar. pp xiv, 600 [208–216]. - ↑ Davies, Wendy (1978).
*An Early Welsh Microcosm: Studies in the Llandaff Charters*. London, UK: Royal Historical Society. p. 33. ISBN 978-0-901050-33-5. - ↑ W.H. Jones (1954). "Pliny's Natural History (Introduction to Chapter 6)". Archived from the original on 1 January 2017. Retrieved 1 June 2014.
- 1 2 Zupko, Ronald Edward (1977).
*British weights & measures: a history from antiquity to the seventeenth century*. University of Wisconsin Press. p. 7. ISBN 9780299073404 . Retrieved 9 December 2011. - ↑ Dominic Rathbone, "Earnings and Costs: Living Standards and the Roman Economy (First to Third Centuries AD), p. 301, in Alan Bowman and Andrew Wilson,
*Quantifying the Roman Economy: Methods and Problems*. - ↑ Skinner, Frederick George (1967).
*Weights and measures: their ancient origins and their development in Great Britain up to A.D. 1855*. H.M.S.O. p. 65. ISBN 9789140059550 . Retrieved 9 December 2011. - ↑ "as,
*n*.",*Oxford English Dictionary*(1st ed.), Oxford: Oxford University Press, 1885. - ↑ "Tabellariae Leges.",
*A Dictionary of Greek and Roman Antiquities*, London: John Murray, 1875. - ↑ "ounce,
*n.*",^{1}*Oxford English Dictionary,*1st ed.*, Oxford: Oxford University Press, 1911.* - ↑ "quincunx,
*n.*",*Oxford English Dictionary,*3rd ed*.*, Oxford: Oxford University Press, 2007. - 1 2 "libra,
*n.*",*Oxford English Dictionary,*1st ed*.*, Oxford: Oxford University Press, 1902. - 1 2 "obelus,
*n.*",*Oxford English Dictionary,*3rd ed*.*, Oxford: Oxford University Press, 2004. - 1 2 "scruple,
*n.*",^{1}*Oxford English Dictionary,*1st ed.*, Oxford: Oxford University Press, 1911.* - 1 2 "sextula,
*n.*",*Oxford English Dictionary,*3rd ed*.*, Oxford: Oxford University Press, 2008. - 1 2 "semuncia,
*n.*",*Oxford English Dictionary,*1st ed*.*, Oxford: Oxford University Press, 1911. - ↑ Klein, Herbert Arthur (3 December 2012).
*The Science of Measurement: A Historical Survey*. Courier Corporation. ISBN 9780486144979 – via Google Books. - ↑ "The Julian Calendar".
*timeanddate.com*. Retrieved 25 May 2019.

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