The Jalesnes family were Knights Templars and Knights of St John of Jerusalem.
On July 3, 1189 in the foothills of Hattin, Saladin the Great won a victory over the Frankish armies aided in part by the incompetence of the King of Jerusalem, the betrayal of the Grand Master of the Templars and the brutality of Renaud de Chatillon.
During the action, his horse shot from under him, and one of the Knights Templar, Jacquelin Jalesnes, struggled to his feet, spear in hand, and bravely continued to rebuff the enemy.