King of the Mountain and the Vale

King of the Mountain and the Vale was the title held by the ruler of the Kingdom of the Mountain and the Vale since the Andal invasion of Westeros until the War of Conquest. The first King of the Mountain and the Vale was Ser Artys Arryn, who defeated the last Mountain King and founded House Arryn, a dynasty that ruled the Vale until Aegon the Conqueror unified the Seven Kingdoms under his rule.

In the books
In the A Song of Ice and Fire books, the title of the Vale's ruler during the Arryn dynasty was King of Vale and Sky.