Olga Constantinovna of Russia was a Russian Grand Duchess born on September 3, 1851. She was the daughter of Grand Duke Constantine Nikolaevich of Russia and Princess Alexandra of Saxe-Altenburg. Olga married King George I of Greece in 1867, becoming the Queen of Greece. Throughout her life, Olga was known for her charitable work and dedication to social causes. She played a significant role in supporting various organizations, including hospitals and orphanages. Olga's legacy continues through her descendants, as she was the mother of several children who married into various European royal families.