Iyerhynn was created by the goddess Jhyraea, and he learnt much from her until the time of the Angelic War. He did not directly take part in the war. Instead, he defended the elven races so bitterly that, after the elven god fell, he was risen to the position of god of all elves.
Iyerhynn is protection and devotion. Most elves acknowlege him and what he has done. And as he did, they too will defend their kind to the bitter end.