OK, not quite the end. There was simply a name change. On this date in 1917–July 17–the ruling family of England ceased to be the House of Saxe-Coburg and Gotha and became the House of Windsor.
Three years of war, German aircraft capable of reaching England called Gothas, and a strong anti-German sentiment prompted King George V to bring an end to all German titles held by British nobility. The House of Windsor continues to reign today, with Elizabeth II in the sixty-sixth year on the throne.