King George V, in German uniform, accompanied his cousin Kaiser Wilhelm II of Germany during his visit to Berlin, there they met his German Regiment, the First Dragoon Guards, 1913

Source

George V
Former King of the United Kingdom
George V was King of the United Kingdom and the British Dominions, and Emperor of India, from 6 May 1910 until his death in 1936. Wikipedia
Born: June 3, 1865, Marlborough House, St James’s, United Kingdom
Died: January 20, 1936, Sandringham House, United Kingdom
Spouse: Mary of Teck (m. 1893–1936)
Children: George VI, Edward VIII, MORE
Parents: Edward VII, Alexandra of Denmark
Did you know: George V of the United Kingdom lived to 25,797 days, the seventh-longest among British monarchs. wikipedia.org