Following the death of Pope Clement IV on the 29th of November 1268, the archdeacon of Liège, Tebaldo Visconti, was elected as Pope Gregory X on the 1st of September 1271. This is the longest period between Popes and was caused by a dispute between the French and Italian Cardinals. The dispute was eventually resolved due to pressure from Phillip III of France, and other European monarchs, after it was agreed that a committee of six cardinals would decide the matter.