This isn't true the vast majority were preserved in Byzantium. "The real influence of Dionysius in the West began with the gift in 827 of a Greek copy of his w

This isn't true the vast majority were preserved in Byzantium. "The real influence of Dionysius in the West began with the gift in 827 of a Greek copy of his works by the Byzantine Emperor Michael II to the Carolingian King Louis the Pious. " https://en.wikipedia.org/wiki/Pseudo-Dionysius_the_Areopagite https://en.wikipedia.org/wiki/Pseudo-Dionysius_the_Areopagit... Most were disseminated in Europe after the fourth crusade in which Constantinople was sacked. See also: https://sourcebooks.fordham.edu/byz/byz-mss-art.asp https://sourcebooks.fordham.edu/byz/byz-mss-art.asp