The Count Raymond IV of Toulouse, one of the leaders of the First Crusade, founded the county in 1102 during a lengthy war with the Banu Ammar emirs of Tripoli. The county gradually grew as the crusaders seized much of their territory and besieged Banu Ammar within Tripoli itself. Raymond died in 1105, leaving his infant son Alfonso-Jordan as his heir, with a cousin, William-Jordan of Cerdenya, as Regent. William-Jordan continued the siege of Tripoli until 1109, when the elder son of Raymond, Bertrand arrived in the east, leaving Toulouse to Alfonso-Jordan and his mother, who returned to France. Bertrand and William-Jordan, with mediation from King Baldwin I of Jerusalem, came to an agreement whereby each would keep control of their own conquests. Bertrand captured Tripoli later that year. When William-Jordan died a few months later Bertrand became sole ruler. The county of Tripoli continued to exist as a vassal state of the Kingdom of Jerusalem. Count Raymond III, who reigned from 1152 to 1187, was an important figure in the history of the Kingdom to the south due to his close relationship to its kings and to his own position as Prince of Galilee through his wife. He acted twice as Regent for the kingdom, first for the young Baldwin IV from 1174 to 1177, and then again for Baldwin V from 1185 to 1186. He also acted as the leader of the local nobility in their opposition to Baldwin IV's Courtenay relations with the Templars, Guy of Lusignan, and Reynald of Châtillon. Raymond unsuccessfully argued in favor of peace with Saladin, but, ironically, it was Saladin's siege of Raymond's Countess in Tiberias that led the Crusader army into Galilee before its defeat at Hattin in 1187. Although Raymond survived the battle, he died soon afterward. The county managed to avoid being conquered by Saladin despite the Muslim leader's string of victories. Bohemund IV, second son of Bohemund III of Antioch, succeeded to the Countship upon Raymond's death. After Bohemund III's death in 1201, the county was in personal union with Antioch for all but three years until Antioch's own fall to the Mamluks in 1268. Tripoli survived for a few more years. The death of the unpopular Count Bohemund VII in 1287 led to a dispute between his heir, his sister Lucia, and the city's commune, which put itself under the protection of the Genoese. Eventually, Lucia came to an agreement with the Genoese and the Commune, which displeased the Venetians and the ambitious Bartholomew Embriaco, the Genoese mayor of the city, who called in the Mameluke Sultan Qalawun to their aid. Qalawun razed the city after a siege in 1289, bringing the history of the county to an end.
