The title Earl Mountbatten of Burma was created in the Peerage of the United Kingdom in 1947 for Louis Mountbatten, 1st Viscount Mountbatten of Burma, the last Viceroy of India. The title is the first in over three centuries to allow descent in the female line. The letters patent creating the title specified the "remainder" allowing the title to descend to heirs male, and in default of such issue to his eldest daughter. Lord Mountbatten of Burma's eldest daughter Patricia succeeded as Countess Mountbatten of Burma upon the former's assassination.
The subsidiary titles of Lady Mountbatten of Burma are: Viscountess Mountbatten of Burma, of Romsey in the County of Southampton (created 1946), and Baroness Romsey, of Romsey in the County of Southampton (1947). Both of these titles, in the Peerage of the United Kingdom, have the same special remainder as the Earldom. Lord Romsey is the courtesy title for Lady Mountbatten of Burma's eldest son and heir.
Earls Mountbatten of Burma (1947)