- Born
- Birth nameJelena Petrovna Karadordevic
- Princess Helena was born on November 4, 1884 in Cetinje, Montenegro. She was previously married to John Constantinovitch.
- SpouseJohn Constantinovitch(August 21, 1911 - July 18, 1918) (his death, 2 children)
- RelativesKing Alexander of Yugoslavia(Sibling)King Peter II of Yugoslavia(Niece or Nephew)King Umberto II(Cousin)Helen Petrovic-Njegos of Montenegro(Aunt or Uncle)Grand Duchess Militza Nikolaevna of Russia(Aunt or Uncle)King Nicholas of Montenegro(Grandparent)Prince Paul of Yugoslavia(Cousin)
- Studied medicine at the University of St. Petersburg following her marriage, a career pursuit she had to give up when she gave birth to her first child.
- Daughter of King Peter of Serbia.
- Sister of King Alexander of Yugoslavia.
- Her husband was murdered by the Bolsheviks, along with: his brothers Prince Constantine and Prince Igor; their cousin Prince Vladimir Pavlovich Paley; Grand Duchess Elizabeth Feodorovna (granddaughter of Queen Victoria and Prince Albert); Grand Duke Sergei Mikhailovich (cousin of Czar Aleksandr III); Sergei's secretary; and Varvara Yakovleva, a sister from the Grand Duchess's convent.
- Aunt of King Peter II of Yugoslavia. Great-aunt of Crown Prince Alexander of Serbia.
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