The Emperor of Palamecia (パラメキア皇帝, Paramekia Kōtei?) is the primary antagonist and final boss of Final Fantasy II. He is the ruler of Palamecia who aims to conquer the world through demonic forces. Though known simply as the Emperor in Final Fantasy II, he is named Mateus (マティウス, Matiusu?) in the game's Japan-exclusive novelization: Final Fantasy II Nightmare's Labyrinth by Kenji Terada.
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In Dissidia, as one of the higher-ranking villains, the Emperor is the mastermind of the game's overarching plot to destroy Cosmos and drown the world in darkness. He manipulates hero and villain alike towards this goal.