Apollo didn't "become" the sun god in the way we might think of someone taking on a role. He was born as the sun god in Greek mythology.

Here's the breakdown:

* Parentage: Apollo is the son of Zeus, the king of the gods, and Leto, a Titaness.

* Birth: Apollo was born on the island of Delos, which was chosen by his mother to avoid the wrath of Hera, Zeus' jealous wife.

* Attributes: From birth, Apollo was associated with the sun, light, music, poetry, prophecy, healing, and archery. He was often depicted with a lyre, a bow and arrow, and a radiant crown.

Therefore, Apollo's connection to the sun wasn't a chosen path, but an inherent part of his very being. He was born as the sun god, with all the powers and responsibilities that came with that position.