Queen Victoria replaced him. Salisbury remained prime minister for the remainder of Victoria's reign. On 23 September 1896, Victoria surpassed her grandfather George III as the longest-reigning monarch in British history. The Queen requested that any special celebrations be delayed until 1897, to coincide with her Diamond Jubilee, which was made a festival of the British Empire at the suggestion of the Colonial Secretary, Joseph Chamberlain. The prime ministers of all the self-governing Dominions were invited to London for the festivities. One reason for including the prime ministers of the Dominions and excluding foreign heads of state was to avoid having to
Diamond Jubilee of Elizabeth II created specifically for the Diamond Jubilee. At Rideau Hall in Ottawa, she also, on 30 June, unveiled a commemorative stained glass window depicting herself and Queen Victoria with their respective royal cyphers and renditions of the Centre Block of the Canadian parliament during the reign of each monarch. The window, a gift from the Canadian Senate, was installed above the Senate entrance to the Centre Block and dedicated by Governor General David Johnston on 7 February 2012. A corbel within the Sovereigns' Arches of the Senate foyer was sculpted into a rendition of the Queen and unveiled on 9 December