After the conquest of Jerusalem in 1099 the Kingdom of the Franks did not endure a perpetual state of emergency, as the chroniclers and many historians wanted us to believe. Rather, the roughly ninety years leading to Saladin’s decisive victory over the Frankish army at Hattin in 1187, which put an end to the first Frankish kingdom, can be divided into a period of frequent military engagement between Franks and Muslims, a period of relative security, and a period of sustained Muslim offensive, which resulted in the creation of the Frankish frontier.