John XII of Constantinople | |
|---|---|
| Ecumenical Patriarch of Constantinople | |
| Church | Church of Constantinople |
| In office | 1 January 1294 – 21 January 1303 |
| Predecessor | Athanasius I of Constantinople |
| Successor | Athanasius I of Constantinople |
| Personal details | |
| Born | ? |
| Died | after 1308 |
John XII (Greek: Ἰωάννης; died after 1308) 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]