The article covers the influence of Pope Francis’ apostolic letter motu proprio Mitis Iudex Dominus Iesus on the scope of the principle of contradiction in matrimonial nullity trials. This article will present certain remarks concerning the effect of Pope Franc is’ process reform on the extent of the principle of contradiction in respect of such constituting factors of that principle as: minimum availability of the parties, and the competent forum for determination, having the attributes of neutrality and impartiality. In conclusion, it should be stated that Pope Francis’ trial reform of 2015 extended the scope of the principle of contradiction in matrimonial nullity trial.