Hieromartyr Sisinius of Cyzicus

Hieromartyr Sisinius was bishop of the city of Cyzicus on the shore of the Sea of Marmara. During the persecution of Emperor Diocletian (284–305), the local governor Alexander subjected him to severe torture: the bishop was bound to wild horses and dragged along the ground, beaten, had vinegar poured into his nostrils, and endured other torments — yet, tradition holds, he worked numerous miracles amid his sufferings.

IMPORTANT NOTE: sources disagree on his ultimate fate. The fuller tradition (the Synaxarion of Hieromonk Macarius of Simonopetra) holds that the bishop survived the persecution and lived to see the reign of Constantine the Great, personally defending the Orthodox formula "of one substance with the Father" against Arianism at the First Ecumenical Council (325) — making him more a confessor than a martyr in the strict sense. A shorter calendar tradition instead reports his beheading after the torture. This discrepancy is honestly reflected here rather than resolved by silently picking one version.

His feast is kept on November 23/December 6.