the singers say that the andal hero sor artys arryn rode upon a falcon to slay the griffon king upon the giant’s lance, thereby founding the kingly line of house arryn. this is foolishness, however, a corruption of the true history of the arryns with legends out of the age of heroes. instead, the arryn kings supplanted the high kings of house royce.
when the vale was secured, the andals turned their attention to the rest of westeros and poured forth through the bloody gate. in the wars that followed, andal adventurers carved out small kingdoms from the old realms of the first men and fought one another as often as they fought their enemies.
— [the world of ice and fire] ancient history: the arrival of the andals