Prince Nicholas of Greece and Denmark was the son of which king that was assassinated in 1913?
George I of Greece George I (Greek: Γεώργιος Α΄ , "Geórgios I"; born Prince William of Schleswig-Holstein-Sonderburg-Glücksburg; 24 December 1845 – 18 March 1913) was King of Greece from 1863 until his assassination in 1913.
Princess Olga of Greece and Denmark Princess Olga of Greece and Denmark (Greek: Πριγκίπισσα Όλγα της Ελλάδας και Δανίας , Serbian Cyrillic: "Кнегиња Олга Карађорђевић"; 11 June 1903 – 16 October 1997) was the granddaughter of King George I of Greece and wife of Prince Paul, Prince Regent of the Kingdom of Yugoslavia.