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Gregory Palamas (14th century):
They live by their bows and swords, rejoicing in enslavement, raiding, looting, wantonness, adultery, sodomy. And not only do they indulge in such practices, but they think that God approves them.
Leonard of Chios (15th century):
Mehmet II got drunk on the wines of Cyprus and, having a soft spot for young boys, sent for the firstborn of the Greek Orthodox Grand Duke Notaras. A fourteen-year-old adolescent known for his beauty. In front of everyone he raped him, and after the rape he sent for his family. His parents, grandparents, uncles, aunts and cousins were beheaded in front of him. One by one.
Mikhael Doukas (15th century):
In Prusa [Bursa], Bayezid enjoyed the many fruits of good fortune and revelled in the daily homage of many nations. He lacked nothing that was beautiful from the coffers of nations. Boys and girls, selected for their unblemished bodies and beauty of countenance, were there - young and tender youths, and girls who outshone the sun. From where did they come? Romans, Serbs, Vlachs, Albanians, Hungarians, Saxons, Bulgarians and Latins, each speaking his own language and all there against their will. And Bayezid, living idly and wantonly, never ceased from lascivious sexual acts, indulging in licentious behavior with boys and girls. 
Theodore Spandounes (15th century):
They are the most self-indulgent men in the world. They keep many women because their law encourages the propagation of children. But they also cohabit with quantities of men. For all that Mohamet explicitly forbade sodomy and recommended the stoning of those guilty of it, this vice is commonly and openly practiced without fear of God or man.