"Vayne Carudas Solidor (ヴェイン・カルダス・ソリドール Vein Karudasu Soridōru) is the third son of Emperor Gramis and Larsa's older brother, as well as the main antagonist of the game. He is the 27 year-old Hume Consul-Governor of Archadian-occupied Dalmasca, Commandant of the Archadian Empire's Western Armada and a member of House Solidor, whose members had led the Empire for four generations. This in effect makes him a "Prince", though as he claims the democratic nature of the Empire makes him no more eligible for the throne than anyone.
However, while he cares for the welfare of the people and of his family, Vayne is willing to use any means necessary to maintain order and retain power. He ensures the complete subjugation of Nabradia and Dalmasca and exterminates their royal families in order to acquire their deifacted nethicite. He confronts Dalmasca's resistance movement with absolute ruthlessness, accepting no surrender."
Source: Wikipedia, "Characters_of_Final_Fantasy_XII", available under the CC-BY-SA License.