Horus

Horus, was a member of the First Civilization and the son of Osiris and Isis.

When Osiris was murdered, Isis used the Ankh to revive him, but it only brought Osiris back for one night. Using the opportunity, they consummated their love that night, leading to the conception of Horus.

Reference

 * Assassin's Creed 3: Accipiter