Dionysius Exiguus (Latin for "Dionysius the Humble"; Greek: Διονύσιος; – ) was a 6th-century Eastern Roman monk born in Scythia Minor and active in Rome. He was a member of a community of Scythian monks concentrated in Tomis (modern Constanța, Romania), the major city of Scythia Minor. Dionysius is best known as the inventor of Anno Domini (AD) dating, which is used to number the years of both the Gregorian calendar and the (Christianised) Julian calendar. Almost all churches adopted his computus for the dates of Easter.
From around the year 500 until his death, Dionysius lived in Rome. He translated 401 Church canons from Greek into Latin, including the Apostolic Canons and the decrees of the First Council of Nicaea, First Council of Constantinople, Council of Chalcedon, and Council of Sardica, and a collection of the decretals of the popes from Siricius to Anastasius II. These Collectiones canonum Dionysianae had great authority in the West, and they continue to guide church administrations. Dionysius also wrote a treatise on elementary mathematics.
The author of a continuation of Dionysius's Computus, writing in 616, described Dionysius as a "most learned abbot of the city of Rome", and the Venerable Bede gave him the honorific abbas. An abbas was not necessarily an abbot, but any monk, especially a senior and respected monk, and indeed Cassiodorus says in Institutiones that he was still an ordinary monk late in life.
Origins According to his friend and fellow-student, Cassiodorus, Dionysius, although by birth a "Scythian", was in character a true Roman, most learned in Greek and Latin.Dionysius Monachus, Scytha natione, sed moribus omnino Romanus, in utraque lingua valde doctissimus. At the Documenta Catholica Omnia online library. He was also a thorough catholic Christian and an accomplished Scripturist.Dionysius Exiguus in the Catholic Encyclopedia. The use of such an ambiguous, dated term as "Scythian" raises the suspicion that his contemporaries had difficulties classifying him, either from lack of knowledge about him personally or about his native land, Scythia Minor. By the 6th century, the term "Scythian" could mean an inhabitant of Scythia Minor, or simply someone from the north-east of the Greco-Roman world, centred on the Mediterranean. The term had a widely encompassing meaning, devoid of clear ethnic attributes. Even for the "Scythian monk" Joannes Maxentius, friend and companion of Dionysius, the two monks are "Scythian" by virtue of their geographical origin relative to Rome, just as Faustus of Riez is a "Gaul".
The dubious assertion, based on a single Syriac source, that the Eastern-Roman rebel general Vitalian, to whom Dionysius seems to have been related, was of Gothic extraction was the basis for labelling, without any further evidence, all of the Scythian monks, Dionysius included, as "Goths". In Greek and Latin sources, Vitalian is sometimes labelled with the same ambiguous term "Scytha"; he is presented as commanding "Hunnic", "Gothic", "Scythian", "Bessian" soldiers, but this information says more about the general's military endeavours, and bears little relevance to clarifying his origins. Furthermore, since none of the Scythian monks expressed any kinship, by blood or spiritual, with the Arian Goths who at that time ruled Italy, a Gothic origin for Dionysius is questionable. Vitalian seems to have been of local Latinised Thracian stock, born in Scythia Minor or in Moesia; his father bore a Latin name, Patriciolus, while two of his sons had Thracian names and one a Gothic name. By the time of the flourishing of the Scythian monks, the provinces from the Lower Danube, long since Latinised, were already a centre for the production of Latin-speaking theologians. Most likely Dionysius was also of local Thraco-Roman origin (romanized Geto–Dacian), like Vitalian's family to whom he was related, and the rest of the Scythian monks and other Thraco-Roman personalities of the era (Justin I, Justinian, Flavius Aetius, etc.).
Works and translations Dionysius translated standard works from Greek into Latin, principally the "Life of St. Pachomius", the "Instruction of St. Proclus of Constantinople" for the Armenians, the "De opificio hominis" of St. Gregory of Nyssa, and the history of the discovery of the head of St. John the Baptist (written by Archimandrite Markellos). The translation of St. Cyril of Alexandria's synodical letter against Nestorius, and some other works long attributed to Dionysius are now acknowledged to be earlier and are assigned to Marius Mercator.
Of great importance were the contributions of Dionysius to the tradition of canon law. His several collections embrace:
Anno Domini
Dionysius is best known as the inventor of Anno Domini dating, which is used to number the years of both the Gregorian calendar and the Julian calendar. He used it to identify the several Easters in his Easter table, but did not use it to date any historical event. When he devised his table, Julian calendar years were identified by naming the consuls who held office that year; he himself stated that the "present year" was "the consulship of Probus Junior", which he also stated was 525 years "since the incarnation of our Lord Jesus Christ". How he arrived at that number is unknown, but there is evidence of the system he applied. He invented a new system of numbering years to replace the Diocletian years that had been used in an old Easter table because he did not wish to continue the memory of a tyrant who persecuted Christians. It has been suggested that he arranged the numbers so that leap years would be exactly divisible by four, and that his new table would begin one "Victorian cycle" (see below), i.e. 532 years, after his new epoch.
Evidence exists that Dionysius' desire to replace Diocletian years with a calendar based on the incarnation of Christ was to prevent people from believing in the imminent end of the world. At the time, some believed that the Second Coming and end of the world would occur 500 years after the birth of Jesus. The current Anno Mundi calendar commenced with the creation of the world based on information in the Greek Septuagint. It was believed that, based on the Anno Mundi calendar, Jesus was born in the year 5500 (or 5500 years after the world was created) with the year 6000 of the Anno Mundi calendar marking the end of the world.Wallraff, Martin: Julius Africanus und die Christliche Weltchronik. Walter de Gruyter, 2006. Anno Mundi 6000 (c. 500) was thus equated with the second coming of Christ and the end of the world.
Easter tables
In 525, Dionysius prepared a table of 95 future dates of Easter (532–626) and a set of rules ("argumenta") explaining their calculation (computus). This followed a request by Pope John I, possibly influenced by the fact that the then current Victorian table gave an Easter date for 526 (19 April) which was the 22nd day of the moon. In a previous embarrassment, this table had given Saturday, 24 April as the date of the Greek Easter in 482. Note well that only the first nine arguments are by Dionysius – arguments 10 to 16 as well as the second paragraphs of 3 and 4 and the third paragraph of 9 are later interpolations. Arguments 11 and 12 imply that these were interpolated in the year 675, shortly before Bede. Dionysius also introduced his table and arguments via a letter to a bishop Petronius (also written in 525) and added another explanatory letter (written in 526). These works in volume 67 of the 217-volume Patrologia Latina also include a letter from Bishop Proterius of Alexandria to Pope Leo (written before 457). Though not named by Dionysius, this collection was recently called his Liber de Paschate (Book on Easter) by Audette.
Dionysius ignored the existing table used by the Patriarchate of Rome, which was prepared in 457 by Victorius of Aquitaine, complaining that it did not obey Alexandrian principles, without actually acknowledging their existence. To be sure that his own table was correct, he simply extended a table prepared in Alexandria that had circulated in the west in Latin, but was never used in the west to determine the date of Easter (however, a variant of it was used in the Byzantine Empire, in Greek). The Latin table was prepared by a subordinate of Bishop Cyril of Alexandria shortly before Cyril's death in 444. It covered a period of 95 years or five decennovenal (19-year) cycles with years dated in the Diocletian Era, whose first year was 285 (the modern historical year in progress at Easter). Diocletian years were advantageous because their division by 19 yielded a remainder equal to the year of the decennovenal cycle
Ultimately, Dionysius Exiguus' Easter table, meanwhile extended from the years 532–626 to the years 532–721, must have been adopted at Rome and also have arrived in Britain and Ireland, where, however in both cases certainly not before the second quarter of the seventh century, Victorius of Aquitaine's lunar limits 16–22 were gradually replaced with Dionysius’ lunar limits 15–21; only then the discord between the churches of Rome and Alexandria regarding the correct date for the celebration of Easter came to an end, and only from then both these authoritative churches used identical tables and hence observed Easter on the same day.
The Greek tables had begun with the new moon which fell (on 29 August) the day before the starting date of their chronology, which was 30 August 284. The epact thus calculated was carried over unchanged by Dionysius into his tables together with a number from one to seven, calculated annually, called by the Greeks the "day of the [planetary] gods" and in the west the "concurrent". This number the Greeks used for calculating the day of the week for any date in the Alexandrian civil calendar (a late form of the Egyptian solar calendar which included a final leap day every four years), which involved no more than simple arithmetic because the twelve months ran consecutively and all had thirty days. These two variables were understood neither by Dionysius nor by the other western computists, who were used to working with the age of the moon on 1 January and the Sunday letters to determine the Sundays. This is why the tables took so long to gain acceptance, but the values were eventually assimilated into the theory, the concurrent as the weekday of 24 March and the epact as the age of the moon on 22 March.
Dionysius Exiguus’ Paschal table owes its strong structure to his distant predecessor Anatolius, who invented the Metonic 19-year lunar cycle, which is an application of the Metonic cycle in the Julian calendar. Its lunar cycle is the nearby variant of Theophilus' 19-year lunar cycle proposed by Annianus and adopted by bishop Cyril of Alexandria in the first half of the fifth century. The Metonic structure of this so-called classical Alexandrian 19-year lunar cycle contained in Dionysius Exiguus’ Paschal table is reflected by the structure of its 19-year periodic sequence of epacts.
The epact, since it originally marked the new moon, was zero in all first decennovenal years. The Latin word nulla meaning no/none was used because no Roman numeral for zero existed. To determine the decennovenal year, the Dionysian year plus one was divided by 19. If the result was zero (to be replaced by 19), it was represented by the Latin word nvlla, also meaning nothing. Both "zeros" continued to be used by (among others) Bede, by whose extension of Dionysius Exiguus’ Easter table to a great Easter cycle all future Julian calendar dates of Easter Sunday were fixed unambiguously at last. However, in medieval Europe one had to wait as late as the second millennium to see the number zero itself come into use, although it had come into being around the year 600 in India.