Mountains of the Moon

From Asoiaf

The Kings of Mountain and Vale were one of the oldest and purest lines of Andal nobility. House Arryn is descended from this line.

Eddard Stark and Robert Baratheon were fostered by Jon Arryn at the Eyrie

King Aerys II Targaryen demanded the heads of Eddard Stark and Robert Baratheon from their warden Lord Jon Arryn. He revolted instead.

278 AL Waymar of House Royce was born.

Ser Waymar Royce became a Sworn Brother of the Night's Watch

After the death of Jon Arryn, Lord of the Eyrie his wife Lysa and son Robert travelled back to the Eyrie.