In those days, Charlemagne failed to invade Saragossa in 778 and then was urged to make the refugees who were west Goths following the army in retreat settle down somewhere.
当時、シャルルマーニュは、778年のサラゴサ遠征に失敗し、その際、退却軍についてきた西ゴート族の難民をどこかへ定住させてやる必要に追われていた。