Original: She was born Princess Jelena of Serbia, and was known as Elena Petrovna, Jelena Petrovna, HÃ lÃ ne Petrovna or Ellen Petrovna after her marriage.
Simplified: After she was married, she was known as Elena Petrovna, Jelena Petrovna, HÃ lÃ ne Petrovna or Ellen Petrovna.