Who was fighting the Battle of Bosworth and why?

The Battle of Bosworth, fought on August 22, 1485, was a pivotal conflict in the Wars of the Roses between the forces of King Richard III of the House of York and Henry Tudor, representing the House of Lancaster. This battle was primarily about the struggle for the English throne, as Richard was the reigning king and Henry sought to claim the crown, having a legitimate claim through his mother. Henry's victory led to the end of the Yorkist reign and the beginning of the Tudor dynasty, marking a significant shift in English history.