Horus (Greek) was a sky and solar god from Upper Egypt from before the unification and one of the oldest gods in the Egyptian mythology and by some concidered to have come from abroad by en early invasion of the Nile Valley. He was the personal symbol of the pharaohs symbolising protection and courage.
Soon he became the Horus (the Elder: Heru, the Younger: Hor) and originated lots of combined deities like Har-pakhrad, Har-Wer etc, which had wide spread cults all over the Nile Valley. He defeated all evilness in the world (symbolically) by defeating Set who had killed his father Osiris. His twin sister was Bast and he was sometimes seen as a child being breast fed sitting in the lap of his mother Isis. In his aspect Horakhty he was the combined god Re-Horakhte.