The County of Tripoli (1102–1289) was the last of the Crusader states. It was founded in the Levant in the modern-day region of Tripoli, northern Lebanon and parts of western Syria.
When the Frankish Crusaders – mostly southern French forces – captured the region in 1109, Bertrand of Toulouse became the first count of Tripoli as a vassal of King Baldwin I of Jerusalem. From that time, the rule of the county was decided not strictly by inheritance but by factors such as military force (external and civil war), favour and negotiation. In 1289 the County of Tripoli fell to Sultan Qalawun of the Muslim Mamluks of Cairo. The county was absorbed into Mamluk Egypt.
Siege of Tripoli
Raymond IV of Toulouse was one of the wealthiest and most powerful of the crusaders. Even so, after the First Crusade, he had failed to secure any land holdings in the Near East. Meanwhile, the County of Edessa, the Kingdom of Jerusalem and the Principality of Antioch had been established. Tripoli was an important strategic goal as it linked the French in the south with the Normans in the north. It was a fertile and well populated area. In 1102, Raymond IV occupied Tortosa (now Tartus) and in 1103, he prepared, together with veterans of the 1101 crusade, to take Tripoli.
On a natural ridge, which he named "Mons Peregrinus" (Mont Pèlerin, Mount Pilgrim), from Tripoli, Raymond IV (also known as Raymond de Saint-Gilles) began the construction of a large castle, known in Arabic as Qal'at Sanjil. Despite this new fortress and seasoned troops, Raymond IV's siege of Tripoli failed to secure the port. He died on 25 February 1105.
Count William of Cerdagne, Raymond IV's cousin and comrade, was supported by Tancred, Prince of Galilee, but his succession in the Tripoli campaign was challenged by Raymond IV's illegitimate son, Bertrand of Toulouse. Bertrand of Toulouse, who was supported by Baldwin I of Jerusalem, arrived in the Near East with a substantial army and a large Genoese fleet.
In order to resolve the succession issue, Baldwin I created a partition treaty.