What started the Russian revolution?

The following reasons were the reasons for the breakout of the Russian Revolution:

• The people of Russia were not happy with the rule of Tsar Nicholas II as he was seen to be an uncaring and weak ruler.
• Russia’s entry into World War I, though met with a positive reception earlier, was now blamed for all the hardships of the country. It didn’t help matters when the Russian army was being defeated in every battle.
• New ideas such as communism and democracy had begun to turn people against the absolute role of the Tsars.

For more relevant articles, refer to the following links:

• Russian Revolution
• Key terms of the Russian Revolution
• October manifesto