Eugenios of Trebizond was a bishop who was martyred during the persecutions led by Diocletian and Maximian. Along with three companions, Candidus, Valerian, and Aquila, he sought refuge in the mountains above his city. After being discovered, the group was subjected to torture and eventually executed by beheading. He is traditionally associated with the destruction of an idol located on a hill overlooking Trebizond, which was later called Mithratis.