After Ottoman conquests of Serbian lands in the late 14th century, conversion of Orthodox Christian Serbs began. Konstantin Mihailović (fl. 1455–63), an Ottoman janissary of Serb origin, spoke of Crypto-Christian Serbs in the janissary corps, having been converted as boys through the Devşirme. The first documented evidence of Crypto-Christianity in Serbs comes from an Ottoman Serbian deli (warrior) confessing to a French ambassador at the Ottoman court in 1568. He confesses that he belongs to the Serb nation and faith, that he lives with Turks and simulates himself (as a Muslim), but that he was born as, and in his heart is, a Christian. Religious syncretism in Serb families is documented in Ottoman documents. An 1848 census of Ottoman Novi Pazar shows instances of "one brother believes in