Henry's first care was to secure his ill-defined and ill-defended frontier, and to recover those border fortresses which had been wrested from Geoffrey by his enemies. In Normandy the Vexin, which was the true military frontier between him and France, and commanded the road to Paris, had been lost. In Anjou he had to win back the castles which had fallen to the House of Blois. His brother Geoffrey, Earl of Nantes, was dead, and he must secure his own succession to the earldom. Two rival claimants were disputing the lordship of Britanny, but Britanny must at all costs be brought into obedience to Henry. There were hostile forces in Angoumois, La Marche, Saintonge, and the Limousin, which had to be finally destroyed. And besides all this, it was necessary to enforce Eleanor's rights over Berri, and her disputed claims to supremacy over Toulouse and Auvergne. Every one of these projects was at once taken in hand. Henry's chancellor, Thomas Becket, was sent from England in 1158 at the head of a splendid embassy to the French court, and when Henry landed in France the success of this mission was declared. A marriage was arranged between his little son Henry, now three years old, and Louis' daughter Margaret, aged six months; and the Vexin was to be restored to Normandy as Margaret's dowry. The English king obtained from Louis the right to judge as lord of Anjou and seneschal of France between the claimants to Britanny; his first entry into that province was with full authority as the officer of France, and the whole army of Normandy was summoned to Avranches to enforce his judgment. Conan was made Duke of Britanny under Henry's lordship, and Nantes was given up into his hands. He secured by treaty with the House of Blois the fortresses which had fallen into their hands, and before the year was out he thus saw his inheritance in Anjou and Normandy, as he had before seen his inheritance in England, completely restored. In November he conducted the King of France on a magnificent progress through Normandy and Britanny, not now as a vassal requiring his help, but with all the pomp of an equal king.