This research is entitled the god 1r-nD-it.f Horus the Avenger or Supporter of his Father. The god appeared in the Osiris myth, which was represented in three elements: the killing of Osiris by his brother Set, the pregnancy of Isis from Osiris after his death by a magical ritual, the battle that took place between Horus and Set to take revenge on him for killing his father and reclaiming his father's throne from his uncle Set, and Osiris' transformation into the ruler of the after life . The importance of the research is due to the fact that this deity has not been given a comprehensive study, but rather the writings about him were scattered during the mention of the god Horus, son of Isis. This research aims to study the god 1r nD it.f and analyze his titles in ancient Egypt until the end the Ptolemaic period, as well as the appearance of the god in Htp dj nsw formula and in the various rituals in the temples, such as purification and Hp-sd rituals ,how he was represented on coffins, tombs , statues ,and  stelae. The research also deals with his role in religion and his relationship with other gods, as well as shedding light on the story of Osiris to understand the forms of the god, his titles, his functions,  and also knowing whether the god 1r-nD-it.f was one of the many forms of the god Horus, son of Osiris, or he was a separate god . The research adopts the descriptive analytical approach to study the deity from the religious and artistic aspects.