On the day the crusaders were set to cross Mount Cadmus, King Louis VII of France chose to take charge of the rear of the column, where the unarmed pilgrims and the baggage trains marched.
Unencumbered by baggage, they reached the summit of Cadmus, where Rancon had been ordered to make camp for the night.
Rancon, however, chose to continue on, deciding in concert with Amadeus III, Count of Savoy, Louis's uncle, that a nearby plateau would make a better campsite.
At this point the Turks, who had been following and feinting for many days, seized their opportunity and attacked those who had not yet crossed the summit.
He is also listed as having participated in the Third Crusade in the Itinerarium Regis Ricardi[2] and appears as a witness to Richard I's peace treaty with Tancred of Sicily in Messina on 6 Oct 1190.