Peter nevertheless had begun making strategic alliances with his neighbouring monarchs. Peter made his brother James II of Majorca sign the treaty of Perpignan in 1279, in which he recognized the Kingdom of Majorca as a feudal kingdom of Peter III (making the Crown of Aragon an indissoluble unity). Peter pressed his advantage and by February 1283 had taken most of the Calabrian coastline. Charles, perhaps feeling desperate, sent letters to Peter demanding they resolve the conflict by personal combat. Peter accepted and Charles returned to France to arrange the duel. Both kings chose six knights to settle on places and dates, and a duel was scheduled for 1 June at Bordeaux. A hundred knights would accompany each side and Edward I of England would adjudge the contest; the English king, heeding the pope, however, refused to take part. Peter left John of Procida in charge of Sicily and returned via his own kingdom to Bordeaux, which he entered in disguise to evade a suspected French ambush. Needless to say, no combat ever took place and Peter returned to find a very turbulent Aragon.