Mezue ahịrịokwu na-esonụ: N'ịbụ onye meriri n'afọ 1347, John VI Kantakouzenos chịrị dị ka onye na-achị achị ruo mgbe nwa ya nwoke bụ Matthew Kantakouzenos wakporo John V na 1352, na-eduga na a
agha obodo nke abụọ. John nke Ise rịọrọ onye na-achị Serbia, bụ́ Stefan Dušan maka enyemaka, Dušan kwekwara site n'izite ndị agha Serbia dị puku mmadụ anọ na-agba ịnyịnya inyere ya aka. Matthew Kantakouzenos rịọrọ nna ya maka enyemaka, na 10,000 Ottoman Turks gosipụtara na Demotika (Didymoteicho) na Ọktọba 1352 wee lụso ndị agha nke ndị agha Serbia nke John V ọgụ n'ọgbọ agha na-emeghe nke rụpụtara mbibi nke ndị agha na mmeri maka ọtụtụ ndị Turks na ọrụ nke ndị Byzantines. N'ụzọ dị otú a, Alaeze Ukwu Ottoman nwetara ókèala mbụ ya na Europe, na Çimpe na Gallipoli. N'ịbụ onye nwere ike iweghachite Constantinople na 1354, John V wepụrụ ma kpochapụ John VI Kantakouzenos; site na 1357, o wepụkwara Matthew, bụ onye ndị Serbs jidere ma gbapụta John V.