Haec sancta synodus
The decree Haec sancta synodus, also called Haec sancta, was promulgated by the fifth session of the Council of Constance on April 6, 1415. It contains a section on the question of whether the Pope is above an ecumenical council or, conversely, such a council is above the Pope. The question is related to papal primacy, papal supremacy and conciliarism.
The decree played an essential role in shaping conciliarism.