Osiris, also called Usir, one of the most important gods of ancient Egypt. Osiris, god of the underworld; and the dead king's son, the living king, was identified with Horus, a god of the sky.
Osiris had many special powers. One of his powers is Osiris was not only the ruler of the dead but also the power that granted all life from the underworld, from vegetation to the annual flood of the Nile River. From 2000 BCE it was believed that every man, not just the deceased kings, became associated with Osiris death
The Osiris myth is the most elaborate and influential story in ancient Egyptian mythology. It concerns the murder of the god Osiris, a primeval king of Egypt, and its consequences. Osiris's murderer, his brother Set, usurps his throne. Meanwhile, Osiris's wife Isis restores her husband's body, allowing him to posthumously conceive their son, Horus. The remainder of the story focuses on Horus, the product of the union of Isis and Osiris, who is at first a vulnerable child protected by his mother and then becomes Set's rival for the throne. Their often violent conflict ends with Horus's triumph, which restores maat (cosmic and social order) to Egypt after Set's unrighteous reign and completes the process of Osiris's resurrection.