The Oriflamme, a pointed, blood-red banner flown from a gilded lance, was the sacred battle standard of the King of France and a symbol of divine intervention on the battlefield from God and Saint Denis in the Middle Ages. The oriflamme originated as the sacred banner of the Abbey of St. Denis, a monastery near Paris. When the oriflamme was raised in battle by the French royalty during the Middle Ages, most notably during the Hundred Years' War, no prisoners were to be taken until it was lowered. Through that tactic, they hoped to strike fear into the hearts of the enemy, especially the nobles, who could usually expect to be taken alive for ransom during such military encounters.

Denis of Paris was a 3rd-century Christian martyr and saint. According to his hagiographies, he was bishop of Paris in the third century and, together with his companions Rusticus and Eleutherius, was martyred for his faith by decapitation. Some accounts placed this during Domitian's persecution and incorrectly identified St Denis of Paris with the Areopagite who was converted by Paul the Apostle and who served as the first bishop of Athens. Assuming Denis's historicity, it is now considered more likely that he suffered under the persecution of the emperor Decius shortly after AD 250.