Saints Cosmas and Damian were twin brothers and early Christian martyrs known for their medical skills. They practiced medicine without charging for their services, earning them the title of "unmercenary physicians." Their dedication to helping the sick and poor made them popular among the people, and they are often invoked for healing. The brothers were martyred during the reign of Emperor Diocletian around the year 287 AD. Their feast day is celebrated on September 26. Saints Cosmas and Damian are the patron saints of physicians, surgeons, and pharmacists, symbolizing compassion and selflessness in the medical profession.