One of the earliest Greek gods to specialize in healing was Asclepius (known to the Romans as Aesculapius). Healers and those in need of healing invoked Asclepius’ name in prayer and healing ceremonies in temples and at home. A healing clan known as the Asclepiads claimed to be the descendants of Asclepius and to have inherited a knowledge and mystical power of healing from him.
Asclepius did not begin as a god, however. It is now thought that he was an actual historical figure, renowned for his healing abilities. When he and his sons, Machaon and Podalirios, are mentioned in The Iliad in approximately the 8th century B.C.E., they are not gods. As his “clan” of followers grew, he was elevated to divine status, and temples were built to him throughout the Mediterranean world well into late antiquity.