House of Windsor
Queen Victoria I married Prince Albert, a son of Duke Ernst I of Saxe-Coburg and Gotha. Therefore her descendants are members of the ducal family of Saxe-Coburg and Gotha. Victoria's eldest son, Edward VII and his son George V reigned as members of this house. But during World War I there was a lot of hatred of anything German. A lot of this feeling was stirred up by newspapers. People with German names were beaten up, and shops with German names had their windows broken.  Even the Royal Family were accused of supporting Germany. On 17 July 1917 George V ordered the Royal Family to give up their German titles, and change German-sounding titles and house names for English-sounding versions. Prince Louis of Battenberg became Lord Louis Mountbatten. The Duke of Teck became the Marquis of Milford Haven and the name of the royal house, and the royal surname was changed to Windsor, after the town of Windsor and Windsor Castle.