Claudius Ptolemy was an Alexandrian mathematician, astronomer, astrologer, geographer, and music theorist, who wrote about a dozen scientific treatises, three of which were of importance to later Byzantine, Islamic, and Western European science. The first is the astronomical treatise now known as the Almagest, although it was originally entitled the Mathēmatikē Syntaxis or Mathematical Treatise, and later known as The Greatest Treatise. The second is the Geography, which is a thorough discussion on maps and the geographic knowledge of the Greco-Roman world. The third is the astrological treatise in which he attempted to adapt horoscopic astrology to the Aristotelian natural philosophy of his day. This is sometimes known as the Apotelesmatika but more commonly known as the Tetrábiblos, from the Koine Greek meaning "Four Books", or by its Latin equivalent Quadripartite.
Pope Benedict XIV, born Prospero Lorenzo Lambertini, was head of the Catholic Church and ruler of the Papal States from 17 August 1740 to his death in May 1758.
Roger Bacon, also known by the scholastic accolade Doctor Mirabilis, was a medieval English philosopher and Franciscan friar who placed considerable emphasis on the study of nature through empiricism. In the early modern era, he was regarded as a wizard and particularly famed for the story of his mechanical or necromantic brazen head. He is sometimes credited as one of the earliest European advocates of the modern scientific method, along with his teacher Robert Grosseteste. Bacon applied the empirical method of Ibn al-Haytham (Alhazen) to observations in texts attributed to Aristotle. Bacon discovered the importance of empirical testing when the results he obtained were different from those that would have been predicted by Aristotle.
William of Ockham, OFM was an English Franciscan friar, scholastic philosopher, apologist, and Catholic theologian, who is believed to have been born in Ockham, a small village in Surrey. He is considered to be one of the major figures of medieval thought and was at the centre of the major intellectual and political controversies of the 14th century. He is commonly known for Occam's razor, the methodological principle that bears his name, and also produced significant works on logic, physics and theology. William is remembered in the Church of England with a commemoration on the 10th of April.
James Ussher was the Church of Ireland Archbishop of Armagh and Primate of All Ireland between 1625 and 1656. He was a prolific scholar and church leader, who today is most famous for his identification of the genuine letters of the church father, Ignatius of Antioch, and for his chronology that sought to establish the time and date of the creation as "the entrance of the night preceding the 23rd day of October... the year before Christ 4004"; that is, around 6 pm on 22 October 4004 BC, per the proleptic Julian calendar.
Celtic Christianity is a form of Christianity that was common, or held to be common, across the Celtic-speaking world during the Early Middle Ages. Some writers have described a distinct Celtic Church uniting the Celtic peoples and distinguishing them from adherents of the Roman Church, while others classify Celtic Christianity as a set of distinctive practices occurring in those areas. Varying scholars reject the former notion, but note that there were certain traditions and practices present in both the Irish and British churches that were not seen in the wider Christian world.
As a moveable feast, the date of Easter is determined in each year through a calculation known as computus. Easter is celebrated on the first Sunday after the Paschal full moon, which is the first full moon on or after 21 March. Determining this date in advance requires a correlation between the lunar months and the solar year, while also accounting for the month, date, and weekday of the Julian or Gregorian calendar. The complexity of the algorithm arises because of the desire to associate the date of Easter with the date of the Jewish feast of Passover which, Christians believe, is when Jesus was crucified.
Inter gravissimas was a papal bull issued by Pope Gregory XIII on 24 February 1582. The document, written in Latin, reformed the Julian calendar. The reform came to be regarded as a new calendar in its own right and came to be called the Gregorian calendar, which is used in most countries today.
The history of the Jews in the current-day Spanish territory stretches back to Biblical times according to Jewish tradition, but the settlement of organised Jewish communities in the Iberian Peninsula possibly traces back to the times after the destruction of the Second Temple in 70 CE. The earliest archaeological evidence of Hebrew presence in Iberia consists of a 2nd-century gravestone found in Mérida. From the late 6th century onward, following the Visigothic monarchs' conversion from Arianism to the Nicene Creed, conditions for Jews in Iberia considerably worsened.
The Apostolic Tradition is an early Christian treatise which belongs to the genre of the ancient Church Orders. It has been described to be of "incomparable importance as a source of information about church life and liturgy in the third century".
Gilbert Foliot was a medieval English monk and prelate, successively Abbot of Gloucester, Bishop of Hereford and Bishop of London. Born to an ecclesiastical family, he became a monk at Cluny Abbey in France at about the age of twenty. After holding two posts as prior in the Cluniac order he was appointed Abbot of Gloucester Abbey in 1139, a promotion influenced by his kinsman Miles of Gloucester. During his tenure as abbot he acquired additional land for the abbey, and may have helped to fabricate some charters—legal deeds attesting property ownership—to gain advantage in a dispute with the Archbishops of York. Although Foliot recognised Stephen as the King of England, he may have also sympathised with the Empress Matilda's claim to the throne. He joined Matilda's supporters after her forces captured Stephen, and continued to write letters in support of Matilda even after Stephen's release.
The Archdiocese of Aix-en-Provence and Arles is a Latin Church ecclesiastical territory or archdiocese of the Catholic Church in France. The archepiscopal see is located in the city of Aix-en-Provence. The diocese comprises the department of Bouches-du-Rhône, in the Region of Provence-Alpes-Côte d'Azur. It is currently a suffragan of the Archdiocese of Marseilles and consequently the archbishop no longer wears the pallium.
Martin Luther was a German priest, theologian, author, hymnwriter, professor, and Augustinian friar. He was the seminal figure of the Protestant Reformation, and his theological beliefs form the basis of Lutheranism.
The Diocese of Piacenza-Bobbio is a Latin diocese of the Catholic Church. It has existed since 1989. In northern Italy, it is a suffragan of the Archdiocese of Modena-Nonantola. The historic Diocese of Piacenza was combined with the territory of the diocese of Bobbio-San Colombano, which was briefly united with the archdiocese of Genoa.
Christianity has been intricately intertwined with the history and formation of Western society. Throughout its long history, the Church has been a major source of social services like schooling and medical care; an inspiration for art, culture and philosophy; and an influential player in politics and religion. In various ways it has sought to affect Western attitudes towards vice and virtue in diverse fields. Festivals like Easter and Christmas are marked as public holidays; the Gregorian Calendar has been adopted internationally as the civil calendar; and the calendar itself is measured from an estimation of the date of Jesus's birth.
Theatrum Chemicum is a compendium of early alchemical writings published in six volumes over the course of six decades. The first three volumes were published in 1602, while the final sixth volume was published in its entirety in 1661. Theatrum Chemicum remains the most comprehensive collective work on the subject of alchemy ever published in the Western world.
Jacopo Dondi dell'Orologio (1290–1359), also known as Jacopo de' Dondi, was a doctor, astronomer and clock-maker active in Padua, Italy. He is remembered today as a pioneer in the art of clock design and construction. He was the father of Giovanni Dondi dell'Orologio. Jacopo Dondi wrote on a number of subjects, including surgery, pharmacology, astrology and natural science.
The Paenitentiale Theodori is an early medieval penitential handbook based on the judgements of Archbishop Theodore of Canterbury. It exists in multiple versions, the fullest and historically most important of which is the U or Discipulus Umbrensium version, composed (probably) in Northumbria within approximately a decade or two after Theodore's death. Other early though far less popular versions are those known today as the Capitula Dacheriana, the Canones Gregorii, the Canones Basilienses, and the Canones Cottoniani, all of which were compiled before the Paenitentiale Umbrense probably in either Ireland and/or England during or shortly after Theodore's lifetime.
The Chronicle of Aniane is an anonymous Latin history covering the rise of the Carolingian family from 670 to 840. It was composed by a monk of the Abbey of Aniane.
Rerum italicarum scriptores ab anno æræ christianæ quingentesimo ad millesimumquingentesimum is a collection of texts which are sources for Italian history from the 6th to the 15th century, compiled in the 18th century by Ludovico Antonio Muratori.
