The Wars of the Roses, a series of dynastic civil wars between two branches of the House of Plantagenet, had been fought in several sporadic episodes, mainly between 1455 and 1485. In 1485, the Lancastrian claimant Henry Tudor defeated the Yorkist king Richard III on Bosworth Field and married Elizabeth of York, daughter of Edward IV and sister to the Princes in the Tower, to unite the houses. In 1490, a young Fleming, Perkin Warbeck, appeared and claimed to be Richard, the younger of the Yorkist "Princes in the Tower" and, thus, a pretender to the English crown. In 1493, Warbeck won the support of Edward IV's sister Margaret, dowager duchess of Burgundy. She allowed him to remain at her court, and gave him 2,000 mercenaries. After the Black Death in the late 14th century, England began to dominate the European cloth market, with trade reaching a first peak in 1447 when exports reached 60,000 cloths. The Low Countries, then Burgundian, were one of England's major export markets, particularly Antwerp. The cloth trade was important to Burgundy, as well as being a major component of the English economy. It was a major act of domestic and foreign policy, thus, for Henry VII to issue a trade embargo — reciprocated by Duke Philip IV of Burgundy — as a result of Margaret's meddling, with Henry forcing the Merchant Adventurers, the company which enjoyed the monopoly of the Flemish wool trade, to relocate from Antwerp to the Pale of Calais and ejecting Flemish merchants from England. Margaret's influence faded after the threat of the removal of her dower lands of County of Artois and Palatine Burgundy and it became clear that the embargo was hurting both the English and the Flemish economies, so the Intercursus Magnus was signed, with Margaret's acceptance of the Tudor succession a condition of the treaty. Philip was also keen to secure English help against France, and so the treaty had very favourable conditions for English merchants. The treaty granted reciprocal trade privileges to English and Flemings and established fixed duties. These certainties greatly aided English export of wool, and thus both Henry VII's treasury and Flemish and Brabantine industry, whilst also providing freedoms to the Hollandic and Zeelandic fisheries. Further treaty promises of impartial justice for English merchants in Burgundian courts were poorly effected. Perkin Warbeck's story ended before the start of the 16th century: in September 1496, he persuaded James IV of Scotland to invade England but, a year later, Warbeck landed in Cornwall with a few thousand troops, fomenting the Second Cornish Uprising of 1497. He was captured at Beaulieu Abbey in Hampshire and hanged at the Tyburn on 23 November 1499.
