Abbot of Westminster; the jewellery and plate belonging to the Crown, which was kept by the Royal Treasurer at Westminster Abbey; and his personal collection of jewels and plate. English monarchs during this period used their personal jewels and plate as a substitute for cash, drawing on them to fund their military campaigns, or giving them as symbolic political gifts. Edward accumulated what historian Jenny Stratford has described as a "vast store of jewels and plate", and his collection of personal treasure was at its greatest during the 1360s. Edward had managed this last category of personal treasure through an organisation called the Privy Wardrobe. The Keeper of the Privy Wardrobe was responsible for guarding and recording the king's belongings, and dispatching particular items around the kingdom, potentially giving them as gifts to the monarch's family and friends. The Privy Wardrobe was initially based in the Tower of London in Edward's reign and became focused on handling the supplies for his campaigns in France. This probably encouraged the King to decide to build a new tower in Westminster to host a separate branch of the Privy Wardrobe specifically to manage his personal jewels and plate. In practice, this branch also managed the clothes, vestments and similar goods belonging to the royal household – effectively, the non-military parts of the King's property. Construction William of Sleaford was put in charge of the tower project as a whole; he was the clerk and surveyor of the king's works within the Palace of Westminster and the Tower of London, and became the Keeper of the Westminster Privy Wardrobe. The Jewel Tower was designed and built by Henry de Yevele, a prominent royal architect, supported by a team of masons he commissioned for both this project and a neighbouring piece of work to build a new clock tower nearby. Hugh Herland was taken on as the chief carpenter for both projects. The payments for the project were recorded on an long parchment roll, which is now held in the Public Record Office. Stone was brought in for the two towers: 98 boat-loads of rough stone and of dressed stone from Maidstone; 469 cart-loads from Reigate; from Devon and from Normandy. Timber was brought from Surrey, red floor tiles from Flanders and of glass purchased for the Jewel Tower alone. A contractor was employed to fix iron grilles to the windows, and 18 locks were