History of England
With Henry VII's accession to the throne in 1485, the Wars of the Roses came to an end, and Tudors would continue to rule England for 118 years. Traditionally, the Battle of Bosworth Field is considered to mark the end of the Middle Ages in England, although Henry did not introduce any new concept of monarchy, and for most of his reign his hold on power was tenuous. He claimed the throne by conquest and God's judgement in battle. Parliament quickly recognized him as king, but the Yorkists were far from defeated. Nonetheless, he married Edward IV's eldest daughter Elizabeth in January 1486, thereby uniting the houses of York and Lancaster.
Post-medieval archaeology
The traditional date for the beginning of the post-medieval period in Britain has been 1485 when, following the Battle of Bosworth the Tudor dynasty took the throne. In practice, the medieval period is now often extended into the reign of the Tudor monarchs and the boundary between the two eras is not precise. As with all attempts to divide the archaeological record into neat chunks, efforts to impose an exact date on the transition are doomed to be questioned by current and new findings.