Head of Saint Denis
The Head of Saint-Denis was an ancient relic, a head-shaped lantern which was fueled by an Apple of Eden. In the Middle Ages, Suger of Saint-Denis used the the lantern to create a powerful sword known as the Eagle of Suger.
In August 1794, Arno Dorian battled a group of tomb raiders sent by Napoleon Bonaparte in order to find the artefact in the First Civilization Temple hidden below the Basilica of Saint-Denis. The Assassin killed the raiders' leader, Philippe Rose, and used the power of the lantern to repel his men from the Temple.
Following the ordeal, Arno contacted the members of the French Assassin Brotherhood, asking them to bring the Apple of Eden to Cairo, and pass it to a man known as Al Mualim, while Arno kept the Head of Saint-Denis itself as a memento.