Tudor queen who was a kingmaker

Overshadowing a large chunk of the 15th century, The War of the Roses raged in England for a shade over 30 years as the descendants of Edward III divided themselves into Yorkists (white rose) who traced their line back to Edward's youngest son, Edmund Duke of York, and Lancastrians (red rose) who traced their line back to Edward's second son, John of Gaunt, Duke of Lancaster.