Fierabras  Fierabras (from French: ', "brave/formidable arm") or Ferumbras"' is a fictional Saracen knight (sometimes of gigantic stature) appearing in several "chansons de geste" and other material relating to the Matter of France. He is the son of Balan, king of Spain, and is frequently shown in conflict with Roland and the Twelve Peers, especially Oliver, whose prowess he almost rivals. Fierabras eventually converts to Christianity and fights for Charlemagne. The oldest extant text of the story of Fierabras is a 12th-century (c. 1170) Old French "chanson de geste" of roughly 6,200 alexandrines in assonanced laisses. The story is as follows: the Saracen king Balan and his son Fierabras return to Spain after sacking the church of Saint Peter's in Rome and taking the relics of the passion. Charlemagne invades Spain to recover the relics and sends his knight Olivier de Vienne, Roland's companion, to battle Fierabras. Once defeated, the giant decides to convert to Christianity and joins Charlemagne's army, but Olivier and several other knights are captured. Floripas, Fierabras' sister, falls in love with one of Charlemagne's knights, Gui de Bourgogne. After a series of adventures, Charlemagne kills king Balan, divides Spain between Fierabras and Gui de Bourgogne (who marries Floripas), and returns to Saint Denis with the holy relics. The poem also survives in an Occitan version dating from the 13th century (roughly 5,000 alexandrines; the first 600 verses do not appear in the Old French version). The Occitan and the Old French version may derive from a common lost source. This version in turn inspired an Italian version ("Cantare di Fierabraccia e Ulivieri") in the second half of the 14th century. Two English versions were made: "Sir Ferumbras" (late 14th or early 15th century) and "Firumbras" (fragmentary). A 15th-century English work, "Sowdon of Babylon", combined the story with another work (the "Destruction de Rome"). The story was put into prose three times in the 14th and 15th centuries:  In Spain the story can be found in the "Historia del emperador Carlomagno y de los doce pares de Francia" by Nicolás of Piemonte first edited in 1521.