The Eyrie is the seat of House Arryn, and the capital of the Vale of Arryn. Anywhere between six, four and two thousand years ago by Roland I Arryn, the Eyrie was the capital of the Kingdom of the Mountain and Vale prior to Aegon's conquest, and remained the capital of the Vale province. It was made a city of the Third Kingdom of the North after it remained entirely neutral during the War of the Five Kings in the show, and in the books continues to remain uninvolved in the affairs of Westeros