History of England
With Henry VII's accession to the throne in 1485, the Wars of the Roses came to an end, and Tudors would continue to rule England for 118 years. Traditionally, the Battle of Bosworth Field is considered to mark the end of the Middle Ages in England, although Henry did not introduce any new concept of monarchy, and for most of his reign his hold on power was tenuous. He claimed the throne by conquest and God's judgement in battle. Parliament quickly recognized him as king, but the Yorkists were far from defeated. Nonetheless, he married Edward IV's eldest daughter Elizabeth in January 1486, thereby uniting the houses of York and Lancaster.
Tudor period
Mary of Guise (lived 1515–60) was a French woman close to the French throne. She ruled as the regent for her teenaged daughter Queen Mary, 1554–60. The regent and her daughter were both strong proponents of Catholicism and attempted to suppress the rapidly Growth of Protestantism in Scotland. Mary of Guise was a strong opponent of Protestantism, and worked to maintain a close alliance between Scotland and France, called the Auld Alliance. In 1559 the Regent became alarmed that widespread Scottish hostility against French rule was strengthening the partisan cause, so she banned unauthorised preaching. But the fiery preacher John Knox sent Scotland aflame with his preaching, leading the coalition of powerful Scottish nobles, calling themselves the Lords of the Congregation raised the rebellion to overthrow the Catholic Church and seize its lands. The Lords appealed to Elizabeth for English help, but she played a very cautious hand. The 1559 treaty with France called for peace and she was unwilling to violate it, especially since England had no allies at the time. Supporting rebels against the lawful ruler violated Elizabeth's deeply held claims to the legitimacy of all royalty. On the other hand, a French victory in Scotland would establish a Catholic state on the northern border supported by a powerful French enemy. Elizabeth first sent money, then sent artillery, then sent a fleet that destroyed the French fleet in Scotland. Finally she sent 8,000 troops north. The death of Mary of Guise allowed England, France and Scotland to come to terms in the Treaty of Edinburgh in 1560, which had a far-reaching impact. France permanently withdrew all its forces from Scotland. It ensured the success of the Reformation in Scotland; it began a century of peace with France; it ended any threat of a Scottish invasion; and it paved the way for a union of the two kingdoms in 1603 when the Scottish king James VI inherited the English throne as James I and launched the Stuart era.