The political and legal views of Marcilia from Padua, Middle Age thinker, shown in his creation «World’s defender» have been analyzed in the article. The author of this creation denies the claims of catholic authority for political mastery in society. He considers that only the strong state and «Priest Roman Empire» headed by the king Lyudovic IV Bavarian, first of all, can introduce peace into disunity Middle Age Europe. Subjecting papacy’s teachings and policy to the criticism Mar-cilia suggests reformation of state and church relations by limiting social functions and powers of priests. The main role, to his opinion, must be given to the landed gentry who could be elected by local believers. Priests must become the handhold of state power acting under the law. Together with it the state power must built a new model of law-making allowing all citizens to participate in law creation. Large democratic potential of the thinker’s creation is in his longing to separate legislative and executive branch. Marcilia suggests to elect the governor for a definite term of office that has been unbelievable for Middle Age. Such Marcilia’s from Padua opinion determined at large that time and became the premises for teachings of the later educational and church reformers of the sixteenth-eighteenth centuries