He's also a very important character in the entire lore of Warcraft, reponsible for all manner of major events, and one of the primary story characters in Warcraft 3 and its expansion, The Frozen Throne.
Also, Twisto; how do you know it's Azeroth and not, say, one of the two moons (the White Lady and the Blue Child... yes, I have read FAR too many Warcraft books), or one of the other cosmic bodies? Never occurred to me that it might be Azeroth until you said, was just wondering what your source/reasoning for this is?