Ernoul was a squire of Balian of Ibelin who wrote an eyewitness account of the fall of Jerusalem in 1187. This was later incorporated into an Old French history of Crusader Palestine now known as the Chronicle of Ernoul and Bernard the Treasurer (French: La Chronique d'Ernoul et de Bernard le trésorier), often abbreviated Ernoul-Bernard. The chronicle covers the years from 1100 until 1228.