Michael I Cerularius
（重定向自Michael Cerularius）
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- Patriarch Michael I redirects here. It can also refer to Patriarch Michael I of Alexandria and to Patriarch Michael I of Antioch.
Michael I Cerularius or Cærularius, also Hellenized as Keroularios (Greek:Μιχαήλ Α΄ Κηρουλάριος; c. 1000 – 21 January 1059 AD) was the Ecumenical Patriarch of Constantinople from 1043 to 1059 AD, most notable for his mutual excommunication with Pope Leo IX that led to the Great Schism.