Matthew I may refer to:
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Matthew I Csák (fl. 1245)
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Pope Matthew I of Alexandria (r. 1378–1408)
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Matthew I of Constantinople
Matthew I ( el, Ματθαῖος Α´), (? – August 1410) was the Ecumenical Patriarch of Constantinople from 1397 to 1410, with a brief interruption in 1402–03.
Matthew entered a monastery as a fifteen-year old. He is known to have been a ...
, Ecumenical Patriarch of Constantinople from 1397 to 1410
{{hndis, Matthew 01