On the background of the complicated political situation caused by the war various political parties tried to reach their objectives. In February 1917 St. Petersburg became the arena of demonstrations and armed conflicts. Forced by the situation Nicholas II had to abdicate in favor of his brother, Mikhail, who in turn abdicated the next day. The reign of Romanov dynasty (1613 – 1917) was over. The power was taken by new government which was named “Temporary”.