Linked from
The 15 pages that link to Battle of Bosworth Field, each with the reason it gives.
Wars of the RosesBroader topic: Richard III’s defeat transferred the crown to Henry Tudor.
Henry VII of EnglandBroader topic: Henry’s victory there brought him the crown and began his reign.
House of YorkBroader topic: Its result ended the Yorkist monarchy.
Tudor periodBroader topic: Henry VII’s victory conventionally marks the period’s beginning.