Konstantin Pavlovich was a grand duke of Russia and the second son of Emperor Paul I and Sophie Dorothea of Württemberg. He was the heir-presumptive for most of his elder brother Alexander I's reign, but had secretly renounced his claim to the... Wikipedia
Born: May 8, 1779, Pushkin, Saint Petersburg, Russia
Died: June 27, 1831 (age 52 years), Vitebsk, Belarus
Spouse: Joanna Grudzińska (m. 1820–1831) and Princess Juliane of Saxe-Coburg-Saalfeld (m. 1796–1820)
Children: Konstantin Konstantinov and Pavel Alexandrov
Aunt: Anna Petrovna