Manuel II Palaiologos

Manuel II Palaiologos or Palaeologus (Greek: Μανουὴλ Παλαιολόγος, romanized: Manouḗl Palaiológos; 27 June 1350 – 21 July 1425) was Byzantine emperor from 1391 to 1425. Shortly before his death he was tonsured a monk and received the name Matthaios (Ματθαίος). Manuel was a vassal of the Ottoman Empire, which sometimes threatened to capture his territory outright. Accordingly he continued his father's practice of soliciting Western European aid against the Ottomans, and personally visited several foreign courts to plead his cause. These efforts failed, although an Ottoman civil war and Byzantine victories against Latin neighbors helped Manuel's government survive and slightly expand its influence. His wife Helena Dragaš saw to it that their sons, John VIII and Constantine XI, became emperors. He is commemorated by the Greek Orthodox Church on 21 July.