From the Wikipedia page
Charles Derek Ross (1924 – 1986) was an English historian of the Late Middle Ages, specialising on the Wars of the Roses. He was Professor of Medieval History at the University of Bristol until his death in 1986, when he was killed by an intruder in his own home.
His best known works are his biographies of Edward IV and Richard III in the Yale English Monarchs series. These influential books were the first modern comprehensive studies of the Yorkist kings' politics, retinues and landownership.