In act 1, Arfagard explains to Fervaal the boy's history and upbringing. Fervaal is the son of a Celtic king, from the land of Cravann, and is destined as the last advocate of the old gods (the "Nuées"). He is charged with the mission of saving his homeland from invasion and pillage but must renounce love to fulfill his duty. Upon Guilhen's return, Fervaal returns her love. However, Arfagard calls for Fervaal to leave her and fulfill his mission. After he finally does take leave of Guilhen, she calls forth a mob of her fellow Saracens to revenge her abandonment by invading Cravann.