In 1692, the Holy Roman Emperor, Leopold I, elevated George's son, Duke Ernest Augustus to the rank of Elector of the Empire as a reward for aid given in the War of the Grand Alliance. There were protests against the addition of a new Elector, and the elevation did not become official (with the approval of the Imperial Diet) until 1708, in the person of Ernest Augustus's son, George Louis. Though the Elector's titles were properly "Duke of Brunswick-Lüneburg" and "Elector of the Holy Roman Empire", he is commonly referred to as the "Elector of Hanover" after his residence.