Question: What is the date of birth of Prince Constantine Constantinovich Of Russia's father?
Sentence (from "Prince Constantine Constantinovich of Russia"): Prince Constantine Constantinovich of Russia ("Константин Константинович"; 1 January 1891 – 18 July 1918), nicknamed Kostya by the family, was the fourth child of Grand Duke Constantine Constantinovich of Russia by his wife Grand Duchess Elizabeth Mavrikievna of Russia.
Relevant evidence: Yes