Henry ("the fat" as he was called, for his easy going manner) played no part in these struggles, but when of age he participated in the 7th crusade under Louis IX of France to destroy the power of Egypt. His forces left behind were forced to surrender in 1250. At about that time, a Cypriot youngster in search of a better education would travel to the empire of Nicaea and eventually become Patriarch of Constantinople as Gregory II. Gregory's autobiography gives valuable information on the transition from Byzantine to Lusignan rule and its impact on the local population and especially education. Meanwhile, Henry takes as his 3rd wife Plaisance of Antioch, who finally bears him a son Hugh II (1253–1267) who came upon the throne while only a few months of age. Plaisance acted as his regent, and is described by one chronicler as "one of the most valiant women in the world". She appeared at Acre, now erupting into virtual war between the Venetians, Pisans, and Knights Templar and the Genoese, Spanish, and the Hospitallers. By backing the Venetians, she hoped to have her son recognized as the King of Jerusalem, but the title had little value. When Plaisance died, Hugh of Antioch became regent. Hugh III Hugh II died childless, and Hugh of Antioch changed his name to Hugh III, (1267–1284), taking from his mother's side in order to revive the Lusignan dynasty. The Christian-friendly Mongols were pushing from the east and offered a chance of alliance against the Egyptian Sultan, but the eternally feuding powers of Medieval Europe threw this chance away, while Hugh tried to mediate with them in Syria. He died in Tyre, succeeded by his oldest son John I (1284–1285), and then by his other son Henry II (1285–1324). His reign and reputation suffered from his epilepsy, and in 1286 he was crowned at Tyre for the kingdom of Jerusalem only to see it fall to Egyptian Mameluk sultan. In 1306, Henry's brother Amaury seized power and exiled Henry in Cilicia, but Henry was restored in 1310. He is mentioned in Dante's Paradiso, but it is not a nice reference. Hugh IV Rule passed on to his nephew Hugh IV (1324–1359), who found himself in a new privileged position. The fall of the last coastal strongholds of the Kingdom of Jerusalem made it unnecessary for the island to waste its money on its defense.