Admiral of the Fleet Louis Alexander Mountbatten, 1st Marquess of Milford Haven, GCB, GCVO, KCMG, PC, formerly Prince Louis Alexander of Battenberg, was a British naval officer and German prince related to the British royal family.
Although born in Austria, and brought up in Italy and Germany, he enrolled in the United Kingdom's Royal Navy at the age of fourteen. Queen Victoria and her son the Prince of Wales occasionally intervened in his career: the Queen thought that there was "a belief that the Admiralty are afraid of promoting Officers who are Princes on account of the radical attacks of low papers and scurrilous ones".
However, Louis welcomed assignments that provided opportunities for him to acquire the skills of war and to demonstrate to his superiors that he was serious about his naval career. Posts on royal yachts and tours arranged by the Queen and Edward actually impeded his progress, as his promotions were perceived as undeserved royal favours.
After a naval career lasting more than forty years, in 1912 he was appointed First Sea Lord, the professional head of the British naval service.