The first Greek parties with an ideological background, conforming to the modern conception of a political party, appeared after 1910, when Eleftherios Venizelos rose to predominance in Greek political life and founded his Liberal Party. The liberal wave of Venizelism resulted soon in the reaction of the "old-system" political leaders, who formed the core of an opposing conservative movement, which used the monarchy as its main rallying banner. Thereby, the two biggest ideological movements, the republican centrist-liberal and the monarchist conservative, emerged and formed massive political organizations.