The Redcrosse Knight, Una, and a dwarf are riding along a plain till rain forces them into a wood; they become somewhat lost and happen upon Error whom the Redcrosse Knight defeats after a struggle. They find their way out of the forest and then happen upon an aged sire who is really Archimago (Anti-Christ or the Pope). He tricks them back to his home where he causes the Redcrosse knight to have a lustful dream about Una; he then creates a false Una who comes to the Redcrosse Knight's bed, tries to seduce him without success, and angers him.