Thus Boniface IX., as a secular prince, occupies an important position; but as pope his activity must be unfavourably judged. Even if Dietrich of Niem frequently painted him too black, there is no question that the means which Boniface employed to fill the papal treasury seriously impaired the prestige of the highest spiritual office and the reverence due to it. His nepotism, again, casts a dark shadow over his memory : but most regrettable of all was his indifference towards the ending of the schism.
The crisis came to a head in the pontificate of Gregory XII. (1406-1415). This pope, so distinguished in many respects, owed his election mainly to the circumstance that he was considered a zealous champion of the restoration of unity within the Church: and he displayed, in fact, during the earlier portion of his reign, an exalted enthusiasm for this great task. Later his attitude changed ; and the protracted negotiations for a conference with Benedict XIII. remained fruitless. The result of this change in the attitude of Gregory was the formation of a strong malcontent party in the college of cardinals; to counteract whose influence, the pope—faithless to the conditions attached to his election— resorted to the plan of creating new members.
At the same period, the relations of Benedict XIII. (anti pope 1394) with France suffered a significant modification. It became more and more manifest that Benedict had no genuine desire to heal the schism in the Church, in spite of the ardent zeal for union which he had displayed immediately before and after his election. In May 1408 France withdrew from his obedience; and it was not long before French policy succeeded in effecting a reconciliation and understanding between the cardinals of Bene dict XIII. and those who had seceded from Gregory XII. Pre cisely as if the Holy See were vacant, the cardinals began to act as the actual rulers of the Church, and issued formal invitations to a council to be opened at Pisa on the Feast of the Annuncia tion (March 25) 1409. Both popes attempted to foil the dis affected cardinals by convening councils of their own; but their efforts were doomed to failure.
On the other hand, the council of the cardinals—though, by the strict rules of canonical law, its convocation was abso lutely illegal—attained the utmost importance. But these rules, and, in fact, the whole Catholic doctrine of the primacy were almost entirely obscured by the schism. Scholars like Langenstein, Gerson and Zabarella, evolved a new theory as to oecumenical councils, which from the point of view of Roman Catholic prin ciples must be described as revolutionary. At the synod of the dissident cardinals assembled at Pisa, views of this type were in the ascendant ; and, although protests were not lacking, the neces sities of the time served as a pretext for ignoring all objections.