John XIII of Constantinople

John XIII of Constantinople (Greek: Ἰωάννης; died after 1320) was the Ecumenical Patriarch of Constantinople from 1315 to 1319.

[1] Prior to becoming the patriarch, he had served in the laity and his name was Glykys Melodos; he was sometimes referred to as John Glykys.

[2][3] One of his students was the Byzantine astronomer and scholar Nicephorus Gregoras.

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