Saint Cosmas and Saint Damian were twins. Both were physicians by profession. So much did they love those who had been baptized and received Holy Communion that they gave all their medical services to them without any charge. Saint Cosmas and Saint Damian were martyred for declaring that “there is absolutely no salvation outside the Catholic Church.” Their relics are sacredly guarded in Rome. They are mentioned in the Roman Canon of the Mass and always in the Litany of the Saints.
Saints Cosmas and Damian (source)
