Also in 1445, Jacques began his famous Feats of Arms. In these, he and another knight would fight a pre-arranged duel in full armor with sharpened weapons. The participants decided the rules of combat beforehand. Fighting typically included three courses each: with the lance on horseback, the sword on horseback, and the spear, poleaxe, sword, or dagger on foot. Sometimes these fights simply went on until one combatant was on the ground. Jacques' first feat of arms was against an Italian knight named Jean de Boniface from the court of King Alfonso V of Aragon. Jean had traveled through Lombardy, Savoy, Burgundy, and Flanders, seeking to distinguish himself in combat. Upon his arrival in Antwerp he made it known that he would take on all comers in combat. Jacques accepted this challenge and beat him.