The use of the title of Princess of the United Kingdom of Great Britain and Northern Ireland is entirely at the will of the sovereign as expressed in letters patent. Individuals holding the title of princess are styled "Her Royal Highness" (HRH). On 18 April 1917, the newest granddaughter of Wilhelm II, German Emperor was styled a British princess from birth, even though Germany and Britain were fighting in WWI. Before the First World War, British princesses also held additional German titles, such as princesses of Hanover by virtue of being male line descendants of George III; or princesses of Saxe-Coburg and Gotha, duchess of Saxony, by virtue of being male line descendants of Prince Albert of Saxe-Coburg and Gotha. George V issued letters patent on 30 November 1917, to restrict the automatic assignment of the title "princess" and the use of the style "Royal Highness" to the following persons: the legitimate daughters of a British sovereign, the legitimate male line granddaughters of a British sovereign, the wife of a British prince. On 31 December 2012, Queen Elizabeth II issued letters patent enabling all children of the eldest son of the prince of Wales to enjoy the princely title and style of Royal Highness, as opposed to only the eldest son. Princesses of the royal blood and princesses by marriage Under the current practice, princesses of the royal blood are the legitimate daughters and the legitimate male line granddaughters of a British sovereign. They are dynasts, that is potential successors to the throne. For these individuals, the title "Princess of the United Kingdom of Great Britain and Northern Ireland" and the style "Her Royal Highness" is an entitlement for life. The title Princess and the style Royal Highness is prefixed to the Christian name, before another title of honour. From 1714 until 1917, the male-line great-granddaughters of the Sovereign were titled "Princess of Great Britain and Ireland" with the style "Highness". Since 1917, the male-line great-granddaughters of the Sovereign have held "the style and title enjoyed by the children of dukes". For example, the daughters of Prince Richard, Duke of Gloucester, a male line grandson of George V, are styled Lady Davina Windsor and Lady Rose Gilman. Princesses by marriage are the recognised wives of the sovereign's sons and male-line grandsons. Generally, these women are entitled to the style "Royal Highness" by virtue of marriage, and retain the style if