Historical Catholic Apologetics on the Council of Constance and the Decree Haec Sancta
Paulus Fabrolottus : The fifth argument that many adversaries take up is from the Council of Constance. At that time, in the fourth session of that council, it defined that a general council [concilium generale] has authority immediately from Christ, which all are held to obey, even if he be Papal in dignity. Thus, either the council was approved by a Roman Pontiff or it was not: either it is legitimate, or it is not. If it is legitimate and was approved, then it is also a matter of faith that a council is above a Pope. If it is illegitimate and rejected, it could not have deposed John XXIII, nor could it have elected Martin V. If Martin V was not legitimately elected and wasn’t a true Pope, though, then no Pope would be a true Pope in the Church, since they all succeed Martin. I respond: the council of Constance is approved and is legitimate in part, and is also rejected in part. Because the approval of the council depends on the Pope, and he can approve some decrees and reject others...