Berkhamsted of the monastic order of Bonhommes, in 1283. In 1300, after Edmund died, Edward I - aka 'Longshanks' took the castle and subsequently granted it to his second queen, Margaret of France. In 1309, Edward I and Margaret's son, Edward II, granted Berkhamsted to his favourite, Piers Gaveston; afterwards In 1317, the castle was given to Edward II's queen, Isabella of France. Edward III further developed the castle and gave it to his son, Edward, the Black Prince, who expanded the hunting grounds. By tradition, Berkhamsted Castle still belongs to the eldest son of the reigning English monarch, via the
Edward the Black Prince differenced royal arms. His younger brother, John of Gaunt, used a similar shield on which the ostrich feathers were ermine. Edward's "shield for peace" is believed to have inspired the badge of three ostrich feathers used by later Princes of Wales. Edward married his cousin, Joan, Countess of Kent (1328–1385), on 10 October 1361. She was the daughter and heiress of Edmund, Earl of Kent, the younger son of King Edward I by his second wife Margaret of France. They had two sons, both born in Aquitaine: From his marriage to Joan, he also became stepfather to her children by