in the Tower of London, while Mary's father went north to reclaim the crown. On 13 April, Warwick was killed at the Battle of Barnet, and on 4 May Edward IV finally defeated the Lancastrian troops at the Battle of Tewkesbury, in which the Lancastrian heir Edward of Westminster was killed and Margaret of Anjou was captured. However, on 12 May, while Edward IV was still on his way to London, the last supporters of the House of Lancaster organized an attack on the Tower, intending to restore Henry VI to the throne; two towers were fired from the river, in one of which was Mary and her family. The attack was repulsed, but this forced Edward IV to put his predecessor to death, and on 21 May 1471 Henry VI was strangled in his dungeon. Final years, marriage plans and death At the end of 1474, Edward IV, who was preparing to invade France, signed a will, according to which Mary and her older sister Elizabeth were to receive a dowry of 10,000 marks, on the condition that the princesses in the matter of marriage would be submissive to their mother and brother-King. However, only two months later, Edward IV concluded a peace treaty with France, one of the conditions of which was the marriage of Mary's elder sister to the Dauphin Charles, heir of the French throne, when she reached the age of marriageable consent; in the event of the premature death of Elizabeth, Mary herself became the substitute bride of the Dauphin; however, in 1481, she, apparently, was betrothed to Frederick, Duke of Holstein and Schleswig (youngest son of King Christian I of Denmark), which meant that France's spare bride was no longer needed. According to other sources, the betrothal never took place: marriage negotiations, shortly after they began, were stopped due to the deteriorating health of the princess. Previously, the elder brother of Frederick, John, Hereditary Prince of Denmark, was called a possible suitor of Mary, but it is not known whether marriage negotiations were ever started. In 1476 Mary, among others, attended the reburial ceremony for the remains of her paternal grandfather the Duke of York and his second son Edmund, Earl of Rutland at Fotheringay. In 1478 Mary attended the wedding of her younger brother Richard, Duke of York and Anne de Mowbray, 8th Countess of Norfolk; in May 1480 she, along with her