Young as he was, and he had only reached his eighteenth year, Edward at once assumed the control of affairs. His first care was to restore good order throughout the country, which under the late government had fallen into ruin, and to free his hands by a peace with France for further enterprises in the North. A formal peace had been concluded by Isabella after her husband's fall; but the death of Charles the Fourth soon brought about new jealousies between the two courts. The three sons of Philip the Fair had followed him on the throne in succession, but all had now died without male issue, and Isabella, as Philip's daughter, claimed the crown for her son. The claim in any case was a hard one to make out. Though her brothers had left no sons, they had left daughters, and if female succession were admitted these daughters of Philip's sons would precede a son of Philip's daughter. Isabella met this difficulty by a contention that though females could transmit the right of succession they could not themselves possess it, and that her son, as the nearest living male descendant of Philip the Fair, and born in the lifetime of the king from whom he claimed, could claim in preference to females who were related to Philip in as near a degree. But the bulk of French jurists asserted that only male succession gave right to the French throne. On such a theory the right inheritable from Philip the Fair was exhausted; and the crown passed to the son of Philip's younger brother, Charles of Valois, who in fact peacefully mounted the throne as Philip the Sixth. Purely formal as the claim which Isabella advanced seems to have been, it revived the irritation between the two courts, and though Edward's obedience to a summons which Philip addressed to him to do homage for Aquitaine brought about an agreement that both parties should restore the gains they had made since the last treaty the agreement was never carried out. Fresh threats of war ended in the conclusion of a new treaty of peace, but the question whether liege or simple homage was due for the duchies remained unsettled when the fall of Mortimer gave the young king full mastery of affairs. His action was rapid and decisive. Clad as a merchant, and with but fifteen horsemen at his back, Edward suddenly made his appearance in 1331 at the French court and did homage as fully as Philip required. The question of the Agénois remained unsettled, though the English Parliament insisted that its decision should rest with negotiation and not with war, but on all other points a complete peace was made; and the young king rode back with his hands free for an attack which he was planning on the North.