The Holy Confessor Sisinius was Bishop of Cyzicus in what is now Turkey. During the persecution of Diocletian he was slated for martyrdom, having been tied behind a horse in an effort to drag him through the streets until death. Sisinius survived, however, and died in the year 325 AD.
Troparion — Tone 8
Champion of Orthodoxy, teacher of purity and of true worship, / the enlightener of the universe and the adornment of hierarchs: / all-wise father Sisinius, your teachings have gleamed with light upon all things. / Intercede before Christ God to save our souls.