Later, the brother of a king sent Bellerophon on a quest to defeat the Chimera, a legendary beast with the head of a lion that breathed fire, a goat’s head sprouting from its back, and the tail of a snake. Together, they defeated it and Bellerophon was honored. Then Bellerophon decided he wanted to be immortal and tried to fly with Pegasus to Mount Olympus, home of the gods. Zeus, angry, sent a gadfly to sting Pegasus, who bucked Bellerophon back to Earth. 