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The 20s decade ran from January 1, AD 20, to December 31, AD 29.
In Europe, the 20s saw revolts by the Aedui, Thracian tribesmen, and the Frisians against the Roman Empire. In North Africa, Tacfarinas, a Numidian Berber deserter, led the Musulamii tribe and a loose and changing coalition of other Berber tribes in revolt, before being defeated in AD 24. In China, the Xin dynasty collapsed and the Eastern Han dynasty was established. In Korea, Daemusin of Goguryeo annexed Dongbuyeo and killed its king Daeso.
In science, the 20s saw the manufacture of pens and metal writing tools in Rome. Major disasters of this decade include a fire in Rome, and the collapse of a poorly built amphitheatre in Fidenae, which killed 20,000 of the 50,000 spectators. In 27, Christianity was born as a Jewish sect in Jerusalem. Geographica , an encyclopedia of geographical knowledge created by Strabo, was finished no later than AD 23.
Manning (2008) tentatively estimates the world population in AD 20 as 246 million.
Due to lack of reliable demographic data, estimates of the world population in the 1st century vary wildly, with estimates for AD 1 varying from 150 [1] to 300 [2] million. Demographers typically do not attempt to estimate most specific years in antiquity, instead giving approximate numbers for round years such as AD 1 or AD 200. However, attempts at reconstructing the world population in more specific years have been made, with Manning (2008) tentatively estimating the world population in AD 20 as 246 million. [3]
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Agrippina "the Elder" was a prominent member of the Julio-Claudian dynasty. She was the daughter of Marcus Vipsanius Agrippa and Augustus' daughter, Julia the Elder. Her brothers Lucius and Gaius Caesar were the adoptive sons of Augustus, and were his heirs until their deaths in AD 2 and 4, respectively. Following their deaths, her second cousin Germanicus was made the adoptive son of Tiberius, Augustus' stepson, as part of Augustus' succession scheme in the adoptions of AD 4. As a result of the adoption, Agrippina was wed to Germanicus in order to bring him closer to the Julian family.
The Julio-Claudian dynasty comprised the first five Roman emperors: Augustus, Tiberius, Caligula, Claudius, and Nero.
Tiberius Julius Caesar Augustus was the second Roman emperor. He reigned from AD 14 until 37, succeeding his stepfather, the first Roman emperor Augustus. Tiberius was born in Rome in 42 BC. His father was the politician Tiberius Claudius Nero and his mother was Livia Drusilla, who would eventually divorce his father, and marry the future-emperor Augustus in 38 BC. Following the untimely deaths of Augustus' two grandsons and adopted heirs, Gaius and Lucius Caesar, Tiberius was designated Augustus' successor. Prior to this, Tiberius had proved himself an able diplomat, and one of the most successful Roman generals: his conquests of Pannonia, Dalmatia, Raetia, and (temporarily) parts of Germania laid the foundations for the empire's northern frontier.
The 10s decade ran from January 1, AD 10, to December 31, AD 19.
The 30s decade ran from January 1, AD 30, to December 31, AD 39.
AD 25 (XXV) was a common year starting on Monday of the Julian calendar. At the time, it was known as the Year of the Consulship of Lentulus and Agrippa. The denomination AD 25 for this year has been used since the early medieval period, when the Anno Domini calendar era became the prevalent method in Europe for naming years.
AD 4 was a common year starting on Wednesday or a leap year starting on Tuesday of the Julian calendar and a leap year starting on Tuesday of the Proleptic Julian calendar. In the Roman Empire, it was known as the Year of the Consulship of Catus and Saturninus. The denomination "AD 4" for this year has been used since the early medieval period, when the Anno Domini calendar era became the prevalent method in Europe for naming years.
AD 8 was a leap year starting on Sunday of the Julian calendar. In the Roman Empire, it was known as the Year of the Consulship of Camillus and Quinctilianus. The denomination "AD 8" for this year has been used since the early medieval period, when the Anno Domini calendar era became the prevalent method in Europe for naming years.
AD 21 (XXI) was a common year starting on Friday of the Julian calendar. At the time, it was known as the Year of the Consulship of Tiberius and Drusus. The denomination AD 21 for this year has been used since the early medieval period, when the Anno Domini calendar era became the prevalent method in Europe for naming years.
AD 23 (XXIII) was a common year starting on Friday of the Julian calendar. At the time, it was known as the Year of the Consulship of Pollio and Vetus. The denomination AD 23 for this year has been used since the early medieval period, when the Anno Domini calendar era became the prevalent method in Europe for naming years.
AD 33 (XXXIII) was a common year starting on Thursday of the Julian calendar. At the time, it was known in the Roman world as the Year of the Consulship of Ocella and Sulla. The denomination AD 33 for this year has been used since the early medieval period, when the Anno Domini calendar era became the prevalent method in the world for naming years.
The 0s BC were the period between 9 BC and 1 BC, the last nine years of the before Christ era. It is one of two "0-to-9" decade-like timespans that contain nine years, along with the 0s.
This article concerns the period 19 BC – 10 BC.
Lucius Aelius Sejanus, commonly known as Sejanus, was a Roman soldier, friend and confidant of the Roman Emperor Tiberius. Of the Equites class by birth, Sejanus rose to power as prefect of the Praetorian Guard, of which he was commander from AD 14 until his execution for treason in AD 31.
Tiberius Julius Caesar Nero Gemellus, known as Tiberius Gemellus was the son of Drusus and Livilla, the grandson of the Emperor Tiberius, and the cousin of the Emperor Caligula. Gemellus is a nickname meaning "the twin". His twin brother, Tiberius Claudius Caesar Germanicus II Gemellus, died as a young child in 23. His father and older cousins died, and are suspected by contemporary sources as having been systematically eliminated by the powerful praetorian prefect Sejanus. Their removal allowed Gemellus and Caligula to be named joint-heirs by Tiberius in 35, a decision that ultimately resulted in Caligula assuming power and having Gemellus killed in late 37 or early 38.
Claudia Livia was the only daughter of Nero Claudius Drusus and Antonia Minor and sister to Roman Emperor Claudius and general Germanicus, and thus paternal aunt of emperor Caligula and maternal great-aunt of emperor Nero, as well as the niece and daughter-in-law of Tiberius. She was named after her grandmother, Augustus' wife Livia Drusilla, and commonly known by her family nickname Livilla. She was born after Germanicus and before Claudius.
Drusus Julius Caesar was the son of Emperor Tiberius, and heir to the Roman Empire following the death of his adoptive brother Germanicus in AD 19.
Drusus Caesar was the adopted grandson and heir of the Roman emperor Tiberius, alongside his brother Nero. Born into the prominent Julio-Claudian dynasty, Drusus was the son of Tiberius' general and heir, Germanicus. After the deaths of his father and of Tiberius' son, Drusus the Younger, Drusus and his brother Nero Caesar were adopted together by Tiberius in September AD 23. As a result of being heirs of the emperor, he and his brother enjoyed accelerated political careers.
Nero Julius Caesar was the adopted grandson and heir of the Roman Emperor Tiberius, alongside his brother Drusus. Born into the prominent Julio-Claudian dynasty, Nero was the son of Tiberius' general and heir, Germanicus. After the deaths of his father and of Tiberius' son, Drusus the Younger, Nero and his brother Drusus were adopted together by Tiberius in September AD 23. As a result of being heirs of the emperor, he and his brother enjoyed accelerated political careers.
The 0s began on January 1, AD 1 and ended on December 31, AD 9, covering the first nine years of the Common Era. It is one of two "0-to-9" decade-like timespans that contain nine years, along with the 0s BC.
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