During the 15th century civil war raged across England as the Houses of York and Lancaster fought each other for the English throne. In 1471 the Yorkists defeated their rivals in the battles of Barnet and Tewkesbury. The Lancastrian King Henry VI and his only son, Edward of Westminster, died in the aftermath of the Battle of Tewkesbury. Their deaths left the House of Lancaster with no direct claimants to the throne. The Yorkist king, Edward IV, was in complete control of England. He attainted those who refused to submit to his rule, such as Jasper Tudor and his nephew Henry, naming them traitors and confiscating their lands. The Tudors tried to flee to France but strong winds forced them to land in Brittany, which was a semi-independent duchy, where they were taken into the custody of Duke Francis II. Henry's mother, Lady Margaret Beaufort, was a great-granddaughter of John of Gaunt, uncle of King Richard II and father of King Henry IV. The Beauforts were originally bastards, but Richard II legitimised them through an Act of Parliament, a decision quickly modified by a royal decree of Henry IV ordering that their descendants were not eligible to inherit the throne. Henry Tudor, the only remaining Lancastrian noble with a trace of the royal bloodline, had a weak claim to the throne, and Edward regarded him as "a nobody". The Duke of Brittany, however, viewed Henry as a valuable tool to bargain for England's aid in conflicts with France, and kept the Tudors under his protection.
