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
Queen dowager simultaneously a former queen consort and the mother of the current monarch. Therefore, every queen mother is by definition also a queen dowager. However, not all queens dowager are queens mother; they may have a relation other than mother to the reigning monarch, such as aunt or grandmother. For example, Mary, Queen of Scots, was queen dowager of France after the death of her husband Francis II, to whom she bore no children. Similarly, Adelaide of Saxe-Meiningen was queen dowager after her husband William IV was succeeded by his niece Victoria. Not every mother of a reigning monarch is a