John Eugenikos [SEP] place of death
John Eugenikos
John Eugenikos (, Constantinople, after 1394 – Laconia, after 1454/5) was a late Byzantine cleric and writer. 
He was the brother of Mark Eugenikos, and like him an ardent opponent of the Union of the Churches. Originally a notary and "nomophylax" at the Patriarchate of Constantinople, his opposition to the Union saw him exiled to the Despotate of the Morea, where he also died. John participated briefly in the Council of Florence that ratified the Union, and also travelled to Trebizond and Mesembria
resulted in no children. Sphrantzes records the date of her death, while John was away in Italy at the Council of Florence; Steven Runciman attributed her death to bubonic plague. She was buried in the church of the Pantokrator monastery in Constantinople. John Eugenikos, brother of Mark Eugenikos of Ephesus, composed a lament for her death.
After Maria's death John never remarried and died childless on 31 October 1448. He was succeeded by his younger brother Constantine XI, who became the last Emperor. Constantine was a widower