About Grand Duchess Maria Mikhailovna of Russia
Grand Duchess Maria Mikhailovna of Russia was the firstborn child and first daughter of Grand Duke Michael Pavlovich, the youngest son of Emperor Paul I of Russia, and Princess Charlotte of Württemberg, the eldest daughter of Prince Paul of Württemberg, who took the name Elena Pavlovna upon converting to Russian Orthodoxy. Maria died, unmarried and without issue, at the age of 21 in Vienna. Maria was known for her fragile health.
Biography source: Wikipedia. The profile adds birthday-specific historical context from the Celebs Birthday Today editorial database.