Anne de Mortimer, Countess of Cambridge was the grandmother of the last of the Plantagenet dynasty whose defeat at Bosworth Field marked the end of what in England?
Richard III of England Richard III (2 October 1452 – 22 August 1485) was King of England from 1483 until his death in 1485, at the age of 32, in the Battle of Bosworth Field. He was the last king of the House of York and the last of the Plantagenet dynasty. His defeat at Bosworth Field, the last decisive battle of the Wars of the Roses, marked the end of the Middle Ages in England. He is the subject of the historical play "Richard III" by William Shakespeare.
Neville–Neville feud The Neville–Neville feud was an inheritance dispute which took place in the North of England during the early fifteenth century between two branches of the Neville family. After the death of Ralph Neville, 1st Earl of Westmorland in 1425, the feud continued through the 1430s, until 1443. It was caused by the transfer of lands and titles to the earl of Westmorland's second wife, Joan Beaufort, and her children. Many of the Neville family holdings were transferred through legal means to Joan's eldest son Richard Neville, 5th Earl of Salisbury, in effect disinheriting Westmorland's issue from his first wife. The title earl of Westmorland passed to the issue of Ralph's first marriage for legal reasons, but many holdings, particularly those of the Neville patrimony in Yorkshire and Raby Castle in Durham were transferred to Joan and her children. The Nevilles had many estates, but their main residence seems to have been Raby Castle. The House of Beaufort was able to consolidate their control over the County Palatine of Durham when Joan's youngest son, Robert Neville, assumed office as Bishop of Durham in 1437.