Osiris and Horus were both gods who were worshiped and decedents of Ra. As well as the pharaoh.
Pharaoh
In Egypt.
Each Pharaoh of ancient Egypt was worshipped as the actual "son" of Ra.
RA - the Sun God
Ramses II was an Egyptian Pharaoh. The Egyptians worshiped a pantheon of gods headed by Ra and Osiris. Ramses II worshiped the whole pantheon to one extent or another, as did the population as a whole.
Ra is worshipped by modern Kemetic Pagans, individuals practicing Kemeticism, and some followers of the Ancient Egyptian religion reconstructionism. He is considered the sun god and one of the most important deities in the Ancient Egyptian pantheon.
Amon was an amazing god he worshiped lots of of things
Ra was the Sun god. The sun is an obvious and powerful object and if one connects it to a pantheon of gods it would seem obvious that it and the God it represents would be worshiped.
He worshiped the sun god Aten (an aspect of Ra), in a monistic way. That is, he recognized the existence of other gods, but only worshiped this one. Basically his religion was the worship of Aten (monism).
Ra is an ancient Egyptian God that is still being worshiped by true Spiritual Satanists. There are many different types of Satanism, but Spiritual Satanism is the ancient Egyptian religion.
Cleopatra VII was believed to have adhered to the Egyptian religion of her time which included gods like Isis and Osiris, as well as the Hellenistic Greek religion due to her Greek heritage. She likely incorporated elements of both faiths into her religious practices.