An Epoch refers to a period of time marked by a sea change of zeitgeist. In this case it refers to the point where the greatest mass of population determines collectively that their grievances and protests are being ignored or met with violence by their leaders, who were imposed through rigged elections or by force.
King Louis XVI was beheaded.
Chiang Kai-Shek Fled to Taiwan from Mao Tse-Tung's Chinese Communist revolution.
Ngo Dimh Diem Was executed in the back of an armored personnel carrier. His power and influence may have been strong enough to prevent the Vietnam war. The Establishment would have none of that.
Fulgencio Batista fled to the Dominican Republic from Fidel Castro's Cuban Communist Revolution.
Muammar Gadaffi tried to nationalize Libyan oil and convince the Middle East Oil Barons to switch to his gold-backed currency instead of U.S. Dollars. Establishment says "no."