What's the deal with Akatosh?
The Unofficial Elder Scrolls Wiki is a great place to read about the lore of Tamriel.
Akatosh (Auri-El to the Aldmer and Alduin to the Nords) is the chief deity of the Nine Divines (the prescribed religious cults of Cyrodiil and its provinces), and one of two deities found in every Tamrielic religion (the other is Lorkhan), save only the Dunmeri Tribunal of self-made gods. His avatar is a dragon, and he is often called the Dragon God of Time.