A Princess of Mars
Most villains in the Barsoom series are implacably evil; are rulers or despots of major empires, or of hidden fiefdoms; are usually hated by their subjects; and possess a voracious sexual appetite, usually directed towards the heroine. The pattern is established by Tharkian Jeddak Tal Hajus in the first novel, "A Princess of Mars". Further examples include the Salensus Oll of "The Warlord of Mars", Nutus of Dusar in "Thuvia, Maid of Mars", and Ul Vas, Jeddak of the Tarids in "Swords of Mars".