Fairies sing around the sleeping Oberon in his bower. Puck enters and recounts Oberon’s quarrel with Titania, his queen: Oberon had vowed not to be reconciled with her, until a pair of human lovers are found who have been faithful to each other through all perils and temptations. Puck has ventured everywhere to find such couples, but in vain. Awakening, Oberon curses the rash vow he made. Puck tells him that the knight Sir Huon has been ordered by Emperor Charlemagne to go to Baghdad, slay the man on the Caliph's right hand, then kiss and wed the Caliph's daughter. Oberon decides that this knight and the princess will be the ones to assist him in his reconciliation with his queen. A vision of Reiza is conjured for Huon and his squire Sherasmin, and they are given a magic horn to summon aid from Oberon if needed. Fairies are called in to carry Huon on his mission.