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.
Roger Mortimer, 4th Earl of March Roger de Mortimer, 4th Earl of March and 6th Earl of Ulster (11 April 1374 – 20 July 1398) was a 14th-century English nobleman. He was considered the heir presumptive to King Richard II after the death in 1382 of his mother Philippa of Clarence (a granddaughter of King Edward III of England) until his own death in 1398.