He is the source of all good things, including peace, friendship, flowers and cute little birdies. He also created humans — accidentally — from the little flecks of dirt that fell while washing his face.
His brother VELNIAS is not nearly so clever, and tends to stomp around being evil instead.
When Christianity came a-calling, he was equated with the Christian GOD, which may or may not have been a pleasant experience. In Latvia he is known as DIEVS. His name in Old Prussian was DEIVAS; this name is still in use today by people who can’t spell.