Apollo is an Olympian deity in classical Greek and Roman mythology. He is associated with poetry, archery, the sun, prophecy, music, healing, and many other things. 

The cult centers of Apollo in Greece, Delphi and Delos, date from the 8th century BCE. The Delos sanctuary was primarily dedicated to Artemis, Apollo's twin sister. At Delphi, Apollo was venerated as the slayer of the monstrous serpent Python. For the Greeks, Apollo was the most Greek of all the gods, and through the centuries he acquired different functions.

When he wasn't busy protecting humans, slaying serpents, or inventing stringed instruments, Apollo also had an exciting love life. 

There are many stories about Apollo's many female lovers, he supposedly was the lover of all nine of the muses along with a collection of nymphs, princesses, queens, and beautiful young women. 

But Apollo didn't stop with the many many women he loved. One of his favorite male lovers was Hyacinth, a young Spartan prince who Apollo accidentally kills. His grief was so great that he made a flower out of Hyacinth blood to commemorate his lover. He also had a collection of princes, kings gods, and a dragon slayer on his list of male lovers. 

Death of Hyacinth
Wikimedia/Alexander Kiselyov