The Martyr Lupus lived at the end of the third century and beginning of the fourth century, and was a faithful servant of the holy Great Martyr Demetrius of Thessalonica (October 26). Being present at the death of his master, he soaked his own clothing with his blood and took a ring from his hand. With this clothing, and with the ring and the name of the Great Martyr Demetrius, Saint Lupus worked many miracles at Thessalonica. He destroyed pagan idols, for which he was subjected to persecution by the pagans, but he was preserved unharmed by the power of God.
Saint Lupus voluntarily delivered himself into the hands of the torturers, and by order of the emperor Maximian Galerius, he was beheaded by the sword.