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The 300th anniversary of the Romanov dynasty occurred on March 6 (February 21 O. S.) 1913, in commemoration of Zemsky Sobor electing Mikhail Fyodorovich Romanov for Tsar of All Russia in 1613.
The major state jubilee was a public celebration by the House of Holstein-Gottorp-Romanov, which commemorated the reign of the House of Romanov in the Russian Empire.
References
300th anniversary of the Romanov dynasty Wikipedia(Text) CC BY-SA