There are three pairs of Unmercenary Physicians named Cosmas and Damian. The two commemorated today were brothers from Rome. Though they inherited great wealth, they gave most of it to the poor and needy, only setting aside enough for themselves to devote their lives to the service of Christ. As Christian physicians, they freely performed their healing services for men and for beasts, asking the healed only to believe in Christ in thanks for their healing. They ended their lives in martyrdom. According to the Prologue, they were summoned before the Emperor Galerius, who interrogated them and commanded them to worship the gods. The brothers refused to do so, but to show the truth of the Christian faith, they healed the Emperor of a grave infirmity. At this he proclaimed the truth of Christianity and released them. But a doctor and a former teacher who envied their reputation lured them into the countryside on the pretext of collecting herbs, then killed them.