As regards the Greeks, the Acts of the Patriarchate (unfortunately only known for the fourteenth century) give the impression that with Mongol agreement the re-establishment of some lost bishoprics was permitted in law, and sometimes in fact. In spite of the difficulties connected with the period when the Mongols became Muslims, Christians and a bishop are to be found at Zile near Sivas, Amasya, Keltzine in Erzincan and Malatya, and communities at Kemah, Nazianzus, Comana near Tokat and others. In the second half of the fourteenth century the activity of a suspected heretic shows again that there were Christians throughout the whole of central Asia Minor, that the Patriarchate of Constantinople had some contact with the localities and that relative isolation did facilitate various forms of propaganda. Linguistically the isolated populations were becoming turcicized to the degree that in the fifteenth century they no longer understood Greek. In western Anatolia, from which the Greek aristocrats had fled, there were no more inter-confessional princely marriages.