"Larsa Ferrinas Solidor (ラーサー・ファルナス・ソリドール Rāsā Farunasu Soridōru) is a 12-year-old Hume, the fourth and youngest son of Emperor Gramis of Archadia, and brother of Vayne. He is by far and quite obviously the Emperor's favorite, and Gramis works tirelessly to ensure that Larsa remains pure and free from the stain of politics and war. Though only twelve years old, Larsa is idealistic and believes that the strife within Ivalice can be quelled without war. Larsa possesses a great deal of respect for House Solidor and the men of his family, especially his older brother. The Senate, however, fears Vayne's growing power and the perceived threat to their own, and thus plot from the beginning of the game to place Larsa on the throne with the hopes of easily manipulating him from behind the scenes."
Source: Wikipedia, "Characters_of_Final_Fantasy_XII", available under the CC-BY-SA License.