Question: Prince Nicholas of Greece and Denmark was the son of which king that was assassinated in 1913?  
Sentence (from "Prince Nicholas of Romania"): Prince Nicholas of Romania (Romanian: "Principele Nicolae a României" ; 5 August 1903 – 9 June 1978), later known as Prince Nicholas of Hohenzollern-Sigmaringen, was the fourth child and second son of King Ferdinand I of Romania and his wife Queen Marie.
Relevant evidence: No