In Diablo 2, an Easter Egg was included that allowed players to visit the "secret cow level". The cow level is inhabited by bipedal cows wielding poleaxes.
These cows are lead by the Cow King. Is there any lore explaining his presence, or referencing the bipedal cows in general?
I know that this was intended to be a joke, but considering the amount of official Diablo fiction I was wondering if an explanation outside of the game had been given. Interviews with developers who gave some "lore" would be acceptable answers, too.