Horus is a Egyptian god, not a actual person - he never ruled Egypt save as the living Pharaoh.
The falcon god and protector of the ruler of the ancient Egypt was named Horus.
The political struggles in Ancient Egypt were reflected in their mythology. Set was considered the ruler of Lower Egypt, and Horus was the ruler of Upper Egypt. Set's followers resisted a unification of Upper Egypt and Lower Egypt. The followers of Horus then designated Set as chaotic and evil. In the myths Set tricks his brother Osiris into shutting himself in a large box and then murders him. Osiris' sun Horus then avenges his father's murder. --information from Wikipedia
Horus' duties are to look after and protect the people of ancient Egypt. He is the ruler of all the Egyptian gods.
Pharaoh was viewed as the living Horus.
Horus was worshiped throughout ancient Egypt.
Cleopatra was the last dynastic ruler of Egypt before it become a Roman provience
In Egyptian myth, Set did not kill his sister Isis, he killed Osiris her husband and brother in a attempt to become the ruler of Egypt. Isis revived Osiris and had Horus who was Set's rival for the throne.
Horus did not lose.
If you mean the Horus from ancient Egypt, no, he was not a Christian.
Hathor's name means "House of Horus"; thus she is the ruler of Horus's house which also means the world itself.
In general, apart from the ruler of the Two Lands (North and South Egypt), the Pharaoh was the manifestation of Horus. When the Pharaoh died, he became Osiris (the father of Horus), and the new Pharaoh became Horus. One of the titles of Horus was 'the High, the Far-off', representing the discernment of a hawk flying high above the ground, yet observing the smallest movement (a useful characteristic for a ruler).
Pharaoh's of ancient Egypt were believed to be Horus incarnate.