Patriarch Sergius I

Patriarch Sergius I may refer to:

• Sergius of Tella, Syriac Orthodox Patriarch of Antioch in 544–546
• Sergius I of Constantinople, Ecumenical Patriarch in 610–638
• Sergius of Bulgaria, Patriarch of Bulgaria c. 931 – c. 940
• Patriarch Sergius of Moscow and All Russia, ruled in 1943–1944

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