The October Revolution (Russian: Октя́брьская револю́ция, tr. Oktyabr'skaya revolyutsiya; IPA: [ɐkˈtʲæbrʲskəjə rʲɪvɐˈlʲʉtsɨjə]), officially known as the Great October Socialist Revolution (Russian: Вели́кая Октя́брьская социалисти́ческая револю́ция, tr. Velikaya Oktyabr'skaya sotsialisticheskaya revolyutsiya), and commonly referred to as Red October, the October Uprising or the Bolshevik Revolution, was a seizure of state power instrumental in the larger Russian Revolution of 1917. It took place with an armed insurrection in Petrograd traditionally dated to 25 October 1917 (by the Julian or Old Style calendar, which corresponds to 7 November 1917 in the Gregorian or New Style calendar).