After the Battle of Waterloo, Parliament agreed to purchase an estate and residence for the Duke of Wellington in recognition of his leadership of the allied armies. The manor of Stratfield Saye was purchased by the nation for this purpose in 1817. In lieu of rent, the Duke and his successors were to give to the sovereign 'one tri-coloured flag' on 'the eighteenth day of June [the date of the Battle of Waterloo]…every year at the Castle of Windsor'. The tricolour is a copy of the French banners captured at the battle. One can be seen in St George's Hall at Windsor in a watercolour prepared for William Henry Pyne's 'History of the Royal Residences' (1816–1819). The banner for the current year is displayed in the Queen's Guard Chamber at Windsor Castle.