Question: Prince Nicholas of Greece and Denmark was the son of which king that was assassinated in 1913?  
Sentence (from "Prince Nicholas of Greece and Denmark"): Prince Nicholas of Greece and Denmark (, 22 January 1872 – 8 February 1938), of the Glücksburg branch of the House of Oldenburg, was the fourth child and third son of King George I of Greece, and of Queen Olga.
Relevant evidence: Yes