Yes they did. That's how we've got Bosnians (and other Serbian-language people of Muslim Nationality), and Albanians, and there's a subset of Bulgarians too as

Yes they did. That's how we've got Bosnians (and other Serbian-language people of Muslim Nationality), and Albanians, and there's a subset of Bulgarians too as far as I remember. They tried to convert people everywhere, there was resistance. Not in the ISIS style, I have to admit. But by hindering Christians and giving preferences to Muslim converts.