Byzantine Empire (Premyslid Bohemia)

Byzantine Empire existed from 395 to 1411 and was ruled by emperors from 16 dynasties. It doverged mainly in 1306. Henry VII of Luxembourg was affraid that Bohemia-Poland War might effect him and tried to give his wifes to fairnes and give his daughter Marie to Andronikos III Palaiolos. Only son Andronikos IV Palaiolos then tried to get rid of Osmans and started major height with Osmas. As his grandson Andronikos V tried to extand it, Osmans started war against them and in 1409 entire empire crushed. Last resored in what we in our timeline call Istanbul Province osmans won against Andonikos in 1411 and entire empire felled under osmans.