John XII of Constantinople

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John XII was the Ecumenical Patriarch of Constantinople from 1294 to 1303. John XII was born in Sozopolis on the western Black Sea coast (now Sozopol, Bulgaria). Prior to becoming patriarch, he was known as Kosmas.[1]


  1. ^ MacGillivray Nicol, Donald (1993). The last centuries of Byzantium, 1261-1453 (2nd ed.). Cambridge University Press. p. 102. ISBN 978-0-521-43991-6. 
Eastern Orthodox Church titles
Preceded by
Athanasius I
Patriarch of Constantinople
Succeeded by
Athanasius I