In the opening battle of England’s War of the Roses, the Yorkists defeat King Henry VI’s Lancastrian forces at St. Albans, 20 miles northwest of London. Many Lancastrian nobles perished, including Edmund Beaufort, the duke of Somerset, and the king was forced to submit to the rule of his cousin, Richard of York. The dynastic struggle between the House of York, whose badge was a white rose, and the House of Lancaster, later associated with a red rose, would stretch on for 30 years. Both families, closely related, claimed the throne through descent from the sons of Edward III, the king of England from 1327 to 1377. The first Lancastrian…