Duke Constantine Petrovich of Oldenburg

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Duke Constantine
Born	(1850-05-09)9 May 1850 Saint Petersburg, Russian Empire
Died	18 March 1906(1906-03-18) (aged 55) Nice, France
Spouse	Agrippina Japaridze ​ (m. 1882)​
Issue	Alexandra Constantinovna, Princess Yurievsky Countess Catherine Constantinovna Count Nicholas Constantinovich Count Alexei Constantinovich Count Peter Constantinovich Countess Nina Constantinovna
Names Constantine Frederick Peter German: Konstantin Friedrich Peter
House	Holstein-Gottorp
Father	Duke Peter of Oldenburg
Mother	Princess Therese of Nassau-Weilburg

Duke Constantine Frederick Peter of Oldenburg (German: Herzog Konstantin Friedrich Peter von Oldenburg; Russian: Константин Петрович Ольденбургский, tr. Konstantin Petrovich Oldenburgskiy; 9 May 1850 – 18 March 1906) was the youngest son of Duke Peter Georgievich of Oldenburg and his wife, Princess Therese of Nassau-Weilburg.^[1] Known in the court of Emperor Nicholas II as Prince Constantine Petrovich Oldenburgsky, he was the father of the Russian Counts and Countesses von Zarnekau.