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 throne in 1823. For 25 days after the death of Alexander I, from 19 November (O.S.)/1 December 1825 to 14 December (O.S.)/26 December 1825 he was known as His Imperial Majesty Konstantin I Emperor and Sovereign of Russia, although he never reigned and never acceded to the throne. His younger brother Nicholas became Tsar in 1825. The succession controversy became the pretext of the Decembrist revolt. Konstantin was known to eschew court etiquette and to take frequent stands against the wishes of his brother Alexander I, for which he is remembered fondly in Russia, but in his capacity as the governor of Poland he is remembered as a hated ruler. Early life Konstantin was born in Tsarskoye Selo on 27 April 1779, the second son of the Tsesarevich Paul Petrovich and his wife Maria Fyodorovna, daughter of Friedrich II Eugen, Duke of Württemberg. Of all Paul's children, Konstantin most closely resembled his father both physically and mentally. His paternal grandmother Catherine the Great named him after Constantine the Great, the founder of the Eastern Roman Empire. A medal with antique figures was struck to commemorate his birth; it bears the inscription "Back to Byzantium" which clearly alludes to Catherine's Greek Plan. According to the British ambassador James Harris, The direction of the boy's upbringing was entirely in the hands of his grandmother, the empress Catherine II. As in the case of her eldest grandson (afterwards the emperor Alexander I), she regulated every detail of his physical and mental education; but in accordance with her usual custom, she left the carrying out of her views to the men who were in her confidence. Count Nikolai Saltykov was supposed to be the actual tutor, but he too in his turn transferred the burden to another, interfering personally only on exceptional occasions, and exercised no influence upon the character of the passionate, restless and headstrong boy. The only person who exerted a responsible influence was Cesar La Harpe, who was tutor-in-chief from 1783 to May 1795 and educated both the empress's grandsons. Catherine arranged Konstantin's marriage as she had Alexander's; Juliane of Saxe-Coburg-Saalfeld, 14, and Konstantin, 16, were married