Relics of the Martyrdom
The defining episode of Lupus's life in the synaxarion is his presence at the martyrdom of his master, Saint Demetrius of Thessalonica, who was put to death during the reign of Maximian. According to the account, Lupus took up the relics of that martyrdom for himself, dipping his garment in the blood of Demetrius and taking the ring from his hand.
These objects became the instruments of his own ministry. The tradition holds that, bearing the blood-soaked garment and the ring and calling upon the name of Saint Demetrius, Lupus healed many at Thessalonica, so that his life is presented as a continuation of his master's intercession.