question: Hvilken slags social system var der i den carolingianske æra?
context: Carolingian Empire
  Martel var også grundlæggeren af alle de feudale systemer og det meritsystem, der prægede det karolingiske imperium og Europa generelt i middelalderen, selv om hans søn og barnebarn fik æren for hans innovationer. Desuden cementerede Martel sin plads i historien med sit forsvar af det kristne Europa mod en muslimsk hær i slaget ved Tours i 732. De iberiske saracener havde inkorporeret berbisk let hestekavaleri med det tunge arabiske kavaleri for at skabe en formidabel hær, som næsten aldrig var blevet besejret. Kristne europæiske styrker manglede i mellemtiden stigbøjlens kraftfulde redskab. Med denne sejr fik Karl tilnavnet Martel ("hammeren"). Edward Gibbon, historikeren om Rom og dets efterspil, kaldte Charles Martel for "sin tids mest fremtrædende fyrste".
context_en: Martel was also the founder of all the feudal systems and merit system that marked the Carolingian Empire, and Europe in general during the Middle Ages, though his son and grandson would gain credit for his innovations. Further, Martel cemented his place in history with his defense of Christian Europe against a Muslim army at the Battle of Tours in 732. The Iberian Saracens had incorporated Berber light horse cavalry with the heavy Arab cavalry to create a formidable army that had almost never been defeated. Christian European forces, meanwhile, lacked the powerful tool of the stirrup. In this victory, Charles earned the surname Martel ("the Hammer"). Edward Gibbon, the historian of Rome and its aftermath, called Charles Martel "the paramount prince of his age".
title_en: Carolingian Empire