 Complete the following phrase:  Princess Olga was a daughter of Prince Nicholas of Greece and Denmark and Grand Duchess Elena Vladimirovna of Russia, and a granddaughter of King George I of Greece. After a brief engagement in 1922 to Crown Prince Frederick of Denmark, she married Prince Paul of Yugoslavia in 1923. In 1934, after the assassination of King Alexander I, Prince Paul was appointed regent of Yugoslavia on behalf of King Peter II, and Princess Olga became the senior lady of the court and acted as first lady of Yugoslavia, working side-by-side with her husband on representation duties. In 1941, during the Second World War, Prince Paul was forcibly removed from power after signing the 