James II was mortally wounded when one of his own cannons exploded during the capture of Roxburgh Castle. He is shown lying in state on the left, with the cannon and the castle in the background. The king’s widow, Mary of Guelders (about 1434-1463), presented her eight-year-old son, the future King James III (1451-1488), as a way of encouraging the soldiers despite this shocking accident. The siege ended two days after the death of James II with an English defeat. It was during James III’s reign that Scotland reached its modern-day shape and size as he regained Orkney and Shetland through his marriage to Margaret of Denmark and lost Berwick-upon-Tweed to England. This mural is one of eight scenes adorning the first floor of the Great Hall in the Scottish National Portrait Gallery.