<P> The migration waves of Byzantine scholars and émigrés in the period following the Crusader sacking of Constantinople and the end of the Byzantine Empire in 1453, is considered by many scholars key to the revival of Greek and Roman studies that led to the development of the Renaissance humanism and science . These emigres were grammarians, humanists, poets, writers, printers, lecturers, musicians, astronomers, architects, academics, artists, scribes, philosophers, scientists, politicians and theologians . They brought to Western Europe the relatively well - preserved remnants and accumulated knowledge of their own (Greek) civilization, which had mostly not survived the Dark Ages in the West . </P> <P> Their main role within the Renaissance humanism was the teaching of the Greek language to their western counterparts in universities or privately together with the spread of ancient texts . Their forerunners were Barlaam of Calabria (Bernardo Massari) and Leonzio Pilato, both drawn from culturally Byzantine Calabria in southern Italy . The impact of these two scholars on the very first Renaissance humanists was indisputable . </P> <P> Collegio Pontifico Greco was a foundation of Gregory XIII, who established a college in Rome to receive young Greeks belonging to any nation in which the Greek Rite was used, and consequently for Greek refugees in Italy as well as the Ruthenians and Malchites of Egypt and Syria . These young men had to study the sacred sciences, in order to spread later sacred and profane learning among their fellow - countrymen and facilitate the reunion of the schismatical churches . The construction of the College and Church of S. Atanasio, joined by a bridge over the Via dei Greci, was begun at once . The same year (1577) the first students arrived, and until the completion of the college were housed elsewhere . </P>

Who was the source of the many writings and texts the renaissance scholars studied