Charles announced his resignation from the senatorship and the vicariate on 30August 1278. He was succeeded by the Pope's brother, Matteo Orsini, in Rome, and by the Pope's nephew, Cardinal Latino Malabranca, in Tuscany. To ensure that Charles fully abandoned his ambitions in central Italy the Pope started negotiations with Rudolf about the restoration of the Kingdom of Arles for Charles' grandson, Charles Martel. Margaret of Provence sharply opposed the plan, but Philip III of France did not stand by his mother. After lengthy negotiations, in the summer of 1279 Rudolf recognised Charles as the lawful ruler of Provence without demanding his oath of fealty. An agreement about Charles Martel's rule in Arles and his marriage to Rudolf's daughter, Clemence, was signed in May 1280. The plan disturbed the rulers of the lands along the Upper Rhone, especially Duke Robert II and Count Otto IV of Burgundy.