The Kingdom of Acre
For the next hundred years, the Kingdom of Jerusalem clung to life as a tiny kingdom hugging the Syrian coastline. Its capital was moved to Acre and controlled most of the coastline of present day Israel and southern and central Lebanon, including the strongholds and towns of Jaffa, Arsuf, Caesarea, Tyre, Sidon, and Beirut. At best, it included only a few other significant cities, such as Ascalon and some interior fortresses, as well as suzerainty over Tripoli and Antioch. The new king, Henry of Champagne, died accidentally in 1197, and Isabella married for a fourth time, to Aimery of Lusignan, Guy's brother. Aimery had already inherited Cyprus from Guy, and had been crowned king by Frederick Barbarossa's son, Emperor Henry VI. Henry led a crusade in 1197 but died along the way. Nevertheless, his troops recaptured Beirut and Sidon for the kingdom before returning home in 1198.[61][62] A five-year truce was then concluded with the Ayyubids in Syria in 1198.[63]
The Ayyubid empire had fallen into civil war after the death of Saladin in 1193. His sons claimed various parts of his empire: az-Zahir took control of Aleppo, al-Aziz Uthman held Cairo, while his eldest son, al-Afdal, retained Damascus. Saladin's brother Al-Adil Sayf ad-Din (often called "Saphadin" by the crusaders) acquired al-Jazira (northern Mesopotamia), and al-Adil's son al-Mu'azzam took possession of Karak and Transjordan. In 1196, al-Afdal was driven out of Damascus by Uthman. He returned when Uthman died in 1198, but was opposed by al-Adil, who occupied the Citadel of Damascus. Al-Adil also conquered Cairo in 1200 and banished al-Afdal from Damascus in 1201. He proclaimed himself Sultan of Egypt and Syria, entrusting Damascus to al-Mu'azzam and al-Jazira to his other son al-Kamil.[64]
Meanwhile, schemes were hatched to reconquer Jerusalem through Egypt. A Fourth Crusade was planned after the failure of the Third, but it resulted in the sack of Constantinople in 1204, and most of the crusaders involved never arrived in the kingdom. Aimery, however, not knowing of the diversion to Constantinople, raided Egypt in advance of the expected invasion.[65] Both Isabella and Aimery died in 1205 and again an underage girl, Isabella and Conrad's daughter Maria of Montferrat, became queen of Jerusalem. Isabella's half-brother John of Ibelin, the Old Lord of Beirut governed as regent until 1210 when Maria married an experienced French knight, John of Brienne.[66] Maria died in childbirth in 1212, and John of Brienne continued to rule as regent for their daughter Isabella II.[67]