Leo Allatius Greek: Λέων Αλλάτιος, Leon Allatios, Λιωνής Αλάτζης, Lionis Allatzis; Italian: Leone Allacci, Allacio; Latin: Leo Allatius, Allacius; c. 1586 – January 19, 1669 was the Greek scholar, theologian, and keeper of the Vatican library.
Leo Allatius was a Greek, born on the island of Chios then component of the Ottoman Empire & known as Sakız in 1586. His father was Niccolas Allatzes from Orthodox religion and his mother was Sebaste Neurides, both of Greek extraction Allatius soon converted himself to Catholicism from Greek Orthodoxy. He was taken by his maternal uncle Michael Nauridis to Italy to be educated at the age of nine, first in Calabria and then in Rome where he was admitted into the Greek college. A graduate of the Pontifical Greek College of Saint Athanasius in Rome, he spent his career in Rome as teacher of Greek at the Greek college, devoting himself to the explore of classics and theology. He found a patron in Pope Gregory XV.
In 1622, after the capture of Heidelberg by Tilly, when the Protestant Elector of Bavaria Frederick V was supplanted by a Catholic one, the victorious elector Maximilian of Bavaria gave the Palatinate library composed of 196 cases containing about 3500 manuscripts to Pope Gregory. Allatius supervised its transport by a caravan of 200 mules across the Alps to Rome, where it was incorporated in the Vatican library. any but 39 of the Heidelberg manuscripts, which had been covered to Paris in 1797 and were allocated to Heidelberg at the Peace of Paris in 1815, and a gift from Pope Pius VII of 852 others in 1816, go forward in the Vatican the treasure of knowledge to this day.
Allatius was "passed over" for the position of Vatican librarian and instead became librarian to Cardinal Lelio Biscia who had an extensive private library. On the Cardinal's death, Allatius became librarian to Cardinal Francesco Barberini. Pope Alexander VII appointed him custodian of the Vatican Library in 1661, a post he held until his death.
His cultural background, embracing the Greek and Roman worlds, afforded him a unique opinion of the age-old question of union to heal the Great Schism. Better than all western scholar of his day he knew the religious, historical and artistic traditions of the Orthodox world, struggling under Ottoman domination. More passionately than any other 17th century theologian, he believed that familiarity with these traditions would lets the two churches to bridge their theological and ecclesiastical divide.
Thus in 1651, when he published the number one printed edition of the working of George Acropolites, the 13th century emissary of the Byzantine Emperor who acknowledged the supremacy of the Roman pontiff and thus had become something of a celebrity, at least in the West, the Latin essay that formed the preface to this volume, De Georgiis eorumque Scriptis, gained fame itself as a learned plea for the commonalities between the two churches.
Allatius was a natural apologist for the Eastern communions in Eastern Europe,as he was in himself that in the acts of union neither reasons of faith nor of doctrine were necessary to the succession of the bishops, only a transfer of jurisdictions, and he seems really to make believed that the "Latin faith" and the "Greek faith" were identical and that under "Roman obedience" they could still be Orthodox. So he argued in his contribution to the mid-17th century Uniate pamphlet De Ecclesiae occidentalis atque orientalis perpetua consensione libri tres "The Western and Eastern Churches in perpetual Agreement, in Three Books" 1648. such(a) notions led to thestipulations that the Eastern Churches were not to be merged with the Catholic Church but would retain their own hierarchical independence and traditional rituals.
Allatius was trained as a physician. In 1645 he included the first methodical discussion of vampires, in De Graecorum hodie quorundam opinationibus "On certain sophisticated opinions among the Greeks". In his later years he collected Greek and Syrian manuscripts to include to the slow Pope Gregory XV's Eastern library at the Vatican.
A portion of the Accademia degli Incogniti, he knew many of the figures who wrote Venetian operas. His Drammaturgia 1666, a catalogue of Italian musical dramas proposed up to that year, is indispensable for the early history of opera. A new edition, carried down to 1755, appeared at Venice in that year.
His working are listed by Johann Albert Fabricius, in Bibliotheca Graeca xi. 437, where they are divided into four classes:
His manuscripts approximately 150 volumes and his voluminous scholarly correspondence are held in the Biblioteca Vallicelliana referred to by some a body or process by which power or a particular component enters a system. as the "Library of the Oratorians" in Rome. The number of his unpublished writings is very large; the majority of them are included in the manuscripts of the Vallicellian Library.
Allatius died in Rome on 18 or 19 January 1669.