Edward's fortune was now at its highest, and his reign promised to have a prosperous and peaceful end. He had reached the age of fifty, and was surrounded by a band of sons who should have been the strength of his old age. Edward the Black Prince he made Duke of Aquitaine; Lionel of Clarence, his second son, was married to the heiress of the great Irish family of de Burgh; John of Gaunt, the third son, was wedded to the heiress of Lancaster; Thomas of Woodstock, his fifth son, to one of the co-heiresses of the earldom of Hereford. Thus he trusted to identify by intermarriage the interests of the royal house and the greater baronage, not seeing that there was as much probability of his younger sons becoming leaders of baronial factions as of the barons forgetting their old jealousy of the royal house. Meanwhile, however, things went fairly well for some years after the peace of Bretigny. In spite of the vast expenditure of money on the war, and in spite of the ravages of the Black Death, the country was in many ways prosperous. England had enjoyed internal quiet for thirty years; her commerce with Flanders and Gascony was developing; her fleet, in spite of much piracy, was dominant in all the Western seas. The increase of wealth is shown by the fact that Edward III. first of all English monarchs issued a large currency of gold money (1349), and that his "nobles," as the broad thin pieces were called, became the favourite medium of exchange in all North-Western Europe, and formed the model for the gold coins of the Netherlands, part of Germany, and Scotland. Manufactures as well as foreign trade were beginning to grow important; the reign of Edward is always remembered for the development of the weaving industry in Eastern England. He induced many Flemish weavers to settle in Norwich and elsewhere, moved, it is said, by the advice of his Netherlandish queen, Philippa of Hainault. But the main exports of England were still raw material--especially wool and metals--and not manufactured goods. The English trader did not usually sail beyond Norway on the one hand, and North Spain on the other; intercourse with more distant countries was carried on mainly by companies of foreign merchants, of whom the men of the Hanse Towns were the most important. These Germans had a factory in London called the Steelyard, where they dwelt in a body, under strict rules and regulations. It was by them that English goods were taken to the more distant markets on the Baltic or the Mediterranean. [Sidenote: =Desultory fighting in Brittany.--Spanish war.=]