The subject is from Torquato Tasso's epic poem, Gerusalemme Liberata, first published in 1581, which tells of the liberation of Jerusalem during the first Crusade. Rinaldo, the Christian hero, has been lulled to sleep by the magic powers of Armida, the Saracen heroine. Just as she is about to kill him, she is overwhelmed by his beauty, and love (in this case personified in the form of Cupid) stays her hand.