Mondain is the principle villain of the computer game Ultima I. Mondain, an evil wizard, is fashioning a gem that will grant him immortality, and the goal of the game is to kill him before he is unstoppable.

Mondain and his legacy make brief appearances in some of the other Ultima games. In Ultima IV, the skull of Mondain is a deadly artifact that must be destroyed. In Ultima V, the Shadowlords were spawned from the three shards of Mondain's shattered gem. And in Ultima VI, along with Minax and Exodus, he haunts one of the Gargoyle shrines.