Grand Duke Konstantin Nikolayevich of Russia (21 September 1827 – 25 January 1892) was the Emperor's Viceroy of Poland from 1862 to 1863. Early life Konstantin Nikolayevich was born as the second son of Nicholas I and his wife, Charlotte of Prussia, daughter of Frederick William III of Prussia and his first wife, Louise of Mecklenburg-Strelitz. Biography The Grand Duke was a supporter of the liberal (sometimes referred to as "enlightened") bureaucrats during the period of his brother Alexander II's great reforms. He served as chairman of the Imperial Russian Geographical Society (founded in 1845). The Geographical Society was subordinate to the Ministry of Internal Affairs, which was home to a conspicuous number of , including Nikolai Miliutin. In addition to his support of and participation in the 1861 emancipation of the serfs, the Grand Duke also instituted reforms in the Imperial Russian Navy from 1854. Konstantin's brother, Alexander II of Russia was supposed to have said: "Let the Poles have their own court and intrigues." Though the Grand Duke tried to show a liberal attitude towards the Poles, his efforts came too late and he was recalled with the outbreak of the January Uprising in 1863. Marriage and issue In the Winter Palace in St Petersburg, on 11 September 1848, Konstantin married Alexandra of Saxe-Altenburg, daughter of Joseph, Duke of Saxe-Altenburg and his wife, Duchess Amelia of Württemberg. They had six children: Grand Duke Nicholas Konstantinovich of Russia (1850–1918) Olga Konstantinovna, Queen of the Hellenes (1851–1926) Grand Duchess Vera Konstantinovna of Russia (1854–1912) Grand Duke Konstantin Konstantinovich of Russia (1858–1915) Grand Duke Dmitry Konstantinovich of Russia (1860–1919) Grand Duke Vyacheslav Konstantinovich of Russia (1862–1879); died of brain hemorrhage At the end of the 1860s, Konstantin embarked on an affair, having an illegitimate daughter, Marie Condousso. Konstantin had five illegitimate children with his mistress Anna Kuznetsova (1847–1922); they bore the last name Knyazev: Sergey Konstantinovich Knyazev (1873–1873); died as an infant. Marina Konstantinovna Knyazeva (8 December 1875 – 8 June 1941); married Alexander Pavlovich Erchov on 23 April 1894. They have nine children. Anna Konstantinovna Knyazeva (16 March 1878 – 5 February 1920); married Nicholas Lialine on 17 April 1898. They have three children. Izmail Konstantinovich Knyazev (2 August 1879 – 1885); died of scarlet fever. Lev Konstantinovich Knyazev (April 1883 – 1885); died of scarlet fever. Konstantin was the paternal great-great-grandfather of King Charles III of the United Kingdom,