The Serbs and the Ottomans

Byzantines were in a desperate bind, despite the fact that constantinople was a centre of christianity. The ottomans would launch military offences against both the bulgarians and the serbians by venturing deep into their lands. John the fifth travelled to rome and converted from the eastern christian orthodox church to roman catholicism in a bid to save constantinople. But it wasn't enough to convince the rRoman catholic church in avignon, and led by the pope, to save Constantinople. In 1380s sultan murad the first made adini his new capital so he could centralize the ottoman position