Windsor Castle

King John undertook some building works at Windsor, but primarily to the accommodation rather than the defences. The castle played a role during the revolt of the English barons: the castle was besieged in 1214, and John used the castle as his base during the negotiations before the sealing of Magna Carta at nearby Runnymede in 1215. In 1216 the castle was besieged again by baronial and French troops under the command of the Count of Nevers, but John's constable, Engelard de Cigogné, successfully defended it.

Edward III was born at Windsor Castle and used it extensively throughout his reign. In 1344 the king announced the foundation of the new Order of the Round Table at the castle. Edward began to construct a new building in the castle to host this order, but it was never finished. Chroniclers described it as a round building, 200 ft (61 m) across, and it was probably in the centre of the Upper Ward.

Edward had further luxurious, self-contained lodgings for his court around the east and south edges of the Upper Ward built, creating the modern shape of the quadrangle. The Norman gate was built to secure the west entrance to the Ward. In the Lower Ward, the chapel was enlarged and remodelled with grand buildings for the canons built alongside. The earliest weight-driven mechanical clock in England was installed for Edward III in the Round Tower in 1354. William of Wykeham went on to build New College, Oxford and Winchester College, where the influence of Windsor Castle can easily be seen.