John Uroš

Jovan Uroš Nemanjić (Serbian Cyrillic: Јован Урош Немањић) or John Ouresis Doukas Palaiologos or Joasaph of Meteora (Greek: Ιωάννης Ούρεσης Δούκας Παλαιολόγος, romanized: Iōannēs Ouresēs Doúkas Palaiologos), was the ruler of Thessaly from c. 1370 to c. 1373, retiring as a monk for the next half century thereafter. He died in 1422 or 1423. By birth, he was member of the Nemanjić dynasty, ruling family of the Serbian Empire.