For 10 points, name this Egyptian sun god.
Isis once forced this god to reveal his name in return for healing a snakebite. This god was the ancestor of all members of the Ennead, which included his children Shu and Tefnut and his grandchildren Geb and Nut. This god's base of worship was (*) Heliopolis, and with the help of Set, this god fends off the attack of the snake Apep as he travels across the sky in his solar barge. For 10 points, name this Egyptian sun god.
Isis once forced this god to reveal his name in return for healing a snakebite.
{Ra} [accept {Re} or {Amun}-{Ra} or {Atum}-{Ra}]