A revolution is a drastic and sudden change which is instigated or propagated by a revolutionary, which means that revolutionaries, as the name suggests, are people who take up the cause of bringing about change in an existing system. Revolutions, in the past, have been responsible for changes in political, religious and even economic ideologies. A revolutionary is generally the one person who decides that he or she has had enough of the perceived injustice enforced by a system and decides to directly or indirectly; take steps to facilitate the removal of the unjust system. The history of the world has shown us examples of such instances in the form of various movements, instigated or propagated by individuals that have led to the complete collapse of entire governments and resulted in the establishment of a new regime or government that is supposed to correct the wrongs of the one it’s replacing. The word revolution can also apply to non-political revolutions like the field of technology and industry which saw its biggest boom during the industrial revolution. During this period production methods saw an increasing shift from manual production to the use of machines to produce goods. Even though, at times, the word revolutionary is used in conjunction with science and art more often than not, it relates to the political aspect of revolutions. Listed below is a list of some of the notable revolutionaries with their complete biographies that include timelines, trivia and life stories.