- "Whilst her son circled the castle, she collected his little ringlets, her own Regent's Coronet, and the ancient Falcon Crown of Mountain and Vale which the Arryns had worn for thousands of years. Ronnel had taken to the sky as a king, but he landed as a lordling. "
- ―Petyr Baelish
The King of the Mountain and the Vale was the ruler of the sovereign Kingdom of the Mountain and the Vale from 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 kingdom until Aegon the Conqueror's invasion of Westeros. The boy-king Ronnel Arryn peacefully submitted his kingdom to Aegon in return for a ride on Visenya Targaryen's dragon Vhagar.