These provisions were regularly disregarded, at the discretion of the cardinals, particularly the requirement of being incommunicado.

Although several times before papal elections were held in the circumstances similar to those described by Ubi periculum,[1] for the first time such situation was formally required by a papal Constitution.

At the time of his death there were probably 15 cardinals in the Sacred College, but only 13 of them participated in the subsequent conclave.

Seven of them were created by Urban IV, four by Gregory X and one by Gregory IX: Two cardinals were absent, including one created by Urban IV and one created by Innocent IV: On January 20, 10 days after the death of Gregory X, 15 cardinals assembled in the episcopal palace in Arezzo.

In the first scrutiny on the following day they unanimously elected French Cardinal Pierre de Tarentaise, bishop of Ostia e Velletri, who took the name of Innocent V. He was the first Dominican pope.