Ultima Online is one of very few games (probably Star Wars Galaxies and that's it) that actually merit the label MMORPG. It's kind of insane when you think about it, that the MMO that most closely came to fulfilling the promise of a "shared, persistent, virtual world" was also the ~first one.

Even if it's not quite technically the first MMO, Origin did also coin the term MMORPG themselves in order to describe Ultima Online to the press.

EVE Online.