House of Romanov (1881–1894), and Nicholas II (1894–1917). Constantine Pavlovich and Michael Alexandrovich, both morganatically married, are occasionally counted among Russia's emperors by historians who observe that the Russian monarchy did not legally permit interregnums. But neither was crowned and both actively declined the throne. The February Revolution of 1917 resulted in the abdication of Nicholas II in favor of his brother Grand Duke Michael Alexandrovich. The latter declined to accept imperial authority save to delegate it to the Provisional Government pending a future democratic referendum, effectively terminating the Romanov dynasty's rule over Russia. After the February Revolution, Nicholas II and his family
Russian Constitution of 1906 the resulting Third and Fourth Dumas proved more lasting, they still quarreled with the Tsar and his government over the general direction of state policy, and over the fundamental nature of the Russian state. Ultimately, with the outbreak of the Russian Revolution of 1917, the Duma took a leading role in bringing about the Tsar's abdication, which led in turn to the abolition of the monarchy and the ascent to power of the Russian Provisional Government under Kerensky. Prior to the enactment of the 1906 Russian constitution, the Russian Empire had been an absolute monarchy, ruled by an autocratic emperor,