According to the "Philosophical Dictionary", proto-utopian ideas begin as early as the period of ancient Greece and Rome, medieval heretics, peasant revolts and establish themselves in the period of the early capitalism, reformation and Renaissance (Hus, Müntzer, More, Campanella), democratic revolutions (Meslier, Morelly, Mably, Winstanley, later Babeufists, Blanquists,) and in a period of turbulent development of capitalism that highlighted antagonisms of capitalist society (Saint-Simon, Fourier, Owen, Cabet, Lamennais, Proudhon and their followers).