The reduction of the insubordinate nobles on the patrimonial estates of the crown was the first problem engaging the attention of the early Capetian kings. When this had at length been solved, with the assistance of the scanty forces lent by the cities--never amounting, it is said, to more than five hundred men-at-arms[4]--Louis the Fat, a prince of resplendent ability, early in the twelfth century addressed himself to the task of making good the royal title to supremacy over the neighboring provinces. Before death compelled him to forego the prosecution of his ambitious designs, the influence of the monarchy had been extended over eastern and central France--from Flanders, on the north, to the volcanic mountains of Auvergne, on the south. Meanwhile the oppressed subjects of the petty tyrants, whether within or around his domains, had learned to look for redress to the sovereign lord who prided himself upon his ability and readiness to succor the defenceless. His grandson, the more illustrious Philip Augustus (1180-1223), by marriage, inheritance, and conquest added to previous acquisitions several extensive provinces, of which Normandy, Maine, and Poitou had been subject to English rule, while Vermandois and Yalois had enjoyed a form of approximate independence under collateral branches of the Capetian family. The conquests of Louis the Fat and of Philip Augustus were consolidated by Louis the Ninth--Saint Louis, as succeeding generations were wont to style him--an upright monarch, who scrupled to accept new territory without remunerating the former owners, and even alienated the affection of provinces which he might with apparent justice have retained, by ceding them to the English, in the vain hope of cementing a lasting peace between the rival states.[5] [Sidenote: France the foremost kingdom of Christendom.]