Whether Tyrannicide is lawful or unlawful was a question on which different views were held by theologians. The murder of the Duke of Orleans by orders of the Duke of Burgundy (1407) helped to stir up the controversy. Amongst the dependants of the Duke of Burgundy was a priest, John Parvus (Petit or Le Petit), who accompanied the Duke to Paris, and in a public assembly defended the Duke of Burgundy on the ground that it was lawful to murder a tyrant (1408). Nine propositions selected from this speech were condemned by the Bishop of Paris, by the Inquisition, and by the university (1414). The Duke of Burgundy appealed to Pope John XXIII., while the representatives of France at the Council of Constance were instructed to seek the opinion of the assembly. The discussion of the subject was complicated by political issues. As the Council of Constance was anxious to avoid all quarrels with the King of France, the Duke of Burgundy, or the Emperor, it contented itself with issuing a very general condemnation of Tyrannicide. Before the council closed, however, the question was raised once more in connexion with a book published by the Dominican, John of Falkenberg, who was a strong partisan of the Teutonic Knights in their struggle against the King of Poland, and who maintained that it was lawful to kill the King of Poland. He undertook the defence of Petit's work, and wrote strongly against the representatives of the University of Paris. The Poles demanded his condemnation, but though he was arrested and detained in prison his book was not condemned by the council. A Dominican chapter held in 1417 repudiated Falkenberg's teaching.