Kym Egen is second born to Lord Egen and captain of guard at the seat of House Arryn, the Eyrie.
Kym Egen was taken to the Eyrie as a ward of Rumar Arryn at the age of three. There he grew up with the third-born son of Lord Arryn, Dake Arryn. They became good friends, and played and trained a lot with each other. Kym later turned out to be a gifted swordsman.
He was travelling through the Seven Kingdoms with Dake Arryn.