'' (c. 1000) A life of Gregory was written by Leontios of the
monastery of San Saba in Rome. Its full title is
An Account of the Life of Saint Gregory, Bishop of the Church of Agrigento. It is a lengthy work in
Greek. It was translated into
Latin in the 18th century by
Stefano Antonio Morcelli. Its two most recent editors disagree regarding the date of its composition and its relative historicity. Albrecht Berger assigns it to the period between 750 and 828 on the grounds that it relies on the
Donation of Constantine (unknown before the mid-8th century). He rejects an early date on the grounds that there is no evidence for Greek-speaking monasteries in Rome before 649. John Martyn, arguing from correspondences between the biography and the papal letters, assigns it an early date of around 640. Leontios is by some said to have died in 688, providing a
terminus ante quem if he is the author. The editors' assessments of Gregory's biography's historical value also differ. For Berger, "though it has a historical core, [it] is in large parts legendary." He does not think that the historical person at the core was the bishop. For Martyn, it is "an important, contemporary document on the cities, clergy and people of Agrigento, Jerusalem, Antioch, Constantinople and Rome during" the papacy of Gregory I and one of very few 7th-century sources on Sicily. There are contradictions in the biography and in the account in the
Synaxarion of Constantinople. The latter has him alive during the patriarchate of Makarios II and the reign of the Emperor
Justinian II (685–711) over a century later. The biography depicts him as a contemporary of the
monothelite controversy, which began in 629. When he is arrested in Agrigento, the Emperor Justinian intervenes with the pope to secure his release. The biography depicts the Sicilian episcopate as supporting Gregory against the papacy and in general has an anti-papal tone. Morcelli, in his Latin edition, argued that the anti-papal tone stemmed from some pamphlets directed against Gregory I that circulated in Rome after his death. To Morcelli, it was evidence of the early date of the biography. The biography of Gregory survives in twenty manuscripts. Besides the original work of Leontios (
BHG 707), there is also a biography (BHG 708) by
Niketas David Paphlagon (fl. c. 900). This was the text used by the compiler
Simeon Metaphrastes in the 10th century. It was one of only 14 texts out of 148 that Simeon left intact and did not rework, and one of only seven that he promised the reader would give them pleasure to read. There are also two shorter reworkings of Leontios' biography, one (BHG 707p) attributed to Mark,
hegoumenos of San Saba, and another (BHG 708f) anonymous. Gregory's feast is celebrated on 23 or 24 November in the
Eastern Orthodox Church. It is on 24 November in the work of Simeon Metaphrastes. It was introduced to the
Roman Martyrology by Cardinal
Caesar Baronius on 23 November. The popularity of Gregory's cult can be gauged by the large number of surviving iconographic representations of him. ==Commentary on
Ecclesiastes==