The Haradrim are independent peoples, but in the Second Age they are caught between the ambitions of Sauron (the Dark Lord) and the Númenóreans, who often kill Haradrim or sell them as slaves, and who become rulers of Harad. Over the centuries many Haradrim fall under Sauron's dominion, and to them Sauron was both king and god, and they feared him exceedingly. They become mixed with Númenórean settlers, some of whom fall under the sway of Sauron as Black Númenóreans. Under King Hyarmendacil I South-victor of Gondor, Harad becomes a vassal of Gondor. By the time of the War of the Ring, the Haradrim are again under the dominion of Sauron, and the Haradrim Corsairs provide the whole of his Black Fleet; many other Haradrim join his armies, some riding mûmakil. In the Battle of the Pelennor Fields, the leader of the Haradrim army is killed by King Théoden of Rohan.