Pope Gregory X (1271–1276) create five cardinals in one consistory.
Contents
Consistory of 3 June 1273
"Presumed cardinals"
According to Cardella in 1275 Gregory X celebrated the second consistory for the creation of two additional cardinals, but modern scholars have established that this never happened:
Apart from the lack of any documentary proof attesting the promotion of these individuals (in the case of Visconti - even of his existence), the contemporary chronicler Salimbene explicitly says that the consistory of 1273 was the only single promotion of the new cardinals in the pontificate of Gregory X, and mentions only five cardinals promoted at that time.
References
Cardinals created by Gregory X Wikipedia(Text) CC BY-SA