Constantine XI Palaiologos
Manuel II Palaiologos or Palaeologus (; 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 "Matthew". His wife Helena Dragaš saw to it that their sons, John VIII Palaiologos and Constantine XI Palaiologos, become emperors.