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
Annexation of Crimea by the Russian Empire territories that had been held by the Khanate. The agreement, signed on 28 December 1783, was negotiated by Russian diplomat Yakov Bulgakov. Annexation of Crimea by the Russian Empire The territory of Crimea, previously controlled by the Crimean Khanate, was annexed by the Russian Empire on . The period before the annexation was marked by Russian interference in Crimean affairs, a series of revolts by Crimean Tatars, and Ottoman ambivalence. The annexation began 134 years of rule by the Russian Empire, which was ended by the revolution of 1917. After changing hands several times during the Russian Civil War, Crimea