Front Page Titles (by Subject) 12.: WORLD-ERAS — ( P. 289 ) - The History of the Decline and Fall of the Roman Empire, vol. 2
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12.: WORLD-ERAS — ( P. 289 ) - Edward Gibbon, The History of the Decline and Fall of the Roman Empire, vol. 2 
The History of the Decline and Fall of the Roman Empire, ed. J.B. Bury with an Introduction by W.E.H. Lecky (New York: Fred de Fau and Co., 1906), in 12 vols. Vol. 2.
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WORLD-ERAS — (P. 289)
The system of Africanus (see above, note 10) which established 5500 years between the creation of the world and the incarnation (σάρκωσις: not the nativity, ἐνανθρωπησις) of Christ was adopted by many subsequent chroniclers: e.g. by Hippolytus, by Sulpicius Severus, by Eutychius. It was also accepted by Eusebius, but in his chronicle (see above, n. 10) he reckoned events from Abraham, 2017 On this system a.m. 5500 was concurrent with our 2
The other most important eras were:—
(1) The “Byzantine” or “Roman” era (adopted in the Chronicon Paschale) = a.m. 5507 (incarnation, 21st March). As this year was identified with 1 we must, in order to reduce a date a.m. to a date , subtract 5508. Thus a.m. 5958 (- 5508) = 450.
(2) The “Antiochene” era (used by John Malalas) = a.m. 5967; but concurrent with 3-2 The rule for reducing a date is: subtract 5970. Thus a.m. 6370 (- 5970) = 400-1. Cp. Gelzer, Sex. Julius Africanus, ii. 132.
(3) The “Ecclesiastical” era of Annianus (adopted by George Syncellus and Theophanes) was a.m. 5501. (The year 5500 ended on 24th March, 5501 began 25th March, day of the immaculate conception. The same day of the month (1st Nisan) was the day of the Creation and the Crucifixion.) This year was concurrent with 9 Therefore to reduce a.m. in Theophanes to we must subtract (5501 - 9 =) 5492. Thus a.m. 6000 (- 5492) = 508.
Annianus (finished his work 412) owed much to his elder contemporary Panodorus (c. 395-408) — as has been shown by Unger, cp. Gelzer, op. cit. ii. 191 — and both were the main foundations of the chronicle of Syncellus. Panodorus invented a different era which found little favour. He placed Christ’s birth in a.m. 5493. Unger has shown that he miscalculated the length of the Ptolemaic dynasty by a year; his era should be 5494. The eras of Annianus and Panodorus are sometimes known as the Alexandrine.