Mufasa was the king of Endor and Piss Rock. Due to the fact he was a lion, people called him the Lion King. He was a hated ruler. Anyone who disobeyed was thrown in a sarlacc pit, or him and his family ate them alive.
Mufasa was born on a random rock lying in the middle of the jungle. The rock in question would later become known as Piss Rock due to the arrogance of the lions, but that is a different story. He later took over Endor too, making the poor ewoks go straight into a sarlacc pit.
Mufasa, born of royal blood, would become the king of Endor, due to the fact all lions were once kings of the jungle.