Martin the Confessor

Our father among the saints Martin the Confessor , Pope of Rome, was a valiant defender of the Roman Church who suffered greatly in order to preserve the divinity of Christ against the Monothelite heresy during the seventh century. He was the last Pope of Rome to be martyred . He is venerated in the East on April 13 ( GOARCH ) or April 14 ( OCA ) (November 12 in the West).

Source: OrthodoxWiki