Another great figure of world history is gone:

Mikhail Gorbachev -- the last leader of the former Soviet Union from 1985 until 1991 -- has died at the age of 91.

Gorbachev died after a long illness, Russian state news agencies reported.

"Mikhail Sergeevich Gorbachev died this evening after a severe and prolonged illness," the Central Clinical Hospital said, according to RIA Novosti Tuesday.

The man credited with introducing key political and economic reforms to the USSR and helping to end the Cold War had been in failing health for some time.

With his outgoing, charismatic nature, Gorbachev broke the mold for Soviet leaders who until then had mostly been remote, icy figures. Almost from the start of his leadership, he strove for significant reforms, so the system would work more efficiently and more democratically. Hence the two key phrases of the Gorbachev era: "glasnost" (openness) and "perestroika" (restructuring).

"I began these reforms and my guiding stars were freedom and democracy, without bloodshed. So the people would cease to be a herd led by a shepherd. They would become citizens," he later said.

Whatever his other faults, the man's role in ending the Soviet Union puts him among the most pivotal and memorable world leaders in history. RIP.

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