Trivial Tuesday

This week's category will be history and mythology.

There is a new book that details a lot of research that has been done concerning the Oracle of Delphi. This was a place in ancient Greece where people could seek prophetic answers from a priestess who seemed to know the future accurately, though often wrapped in more than a bit of mystery. The Oracle and its predictions ended up playing a fairly important role in parts of history. The priestess and temple served a specific deity. Who was this Greek god?

Usual rules apply. Answer quickly and correctly to impress your friends.

Update: Aurora answered quickly and correctly, and, we can only assume, she also impressed her friends. Congrats to Aurora for knowing that the answer was Apollo.