Military history of the Crusader states
The Seljuk–Crusader War began when the First Crusade wrested territory from the Seljuk Turks during the Siege of Nicaea in 1097 and lasted until 1128 when Zengi became atabeg of Aleppo. At the latter date, the chief threat to the Crusaders from the east and north became the Zengids. The conflict was generally fought between European Crusaders and the Seljuk Turks and their vassals. The Muslim Syrian emirates occasionally allied themselves with the Christians against rival states.
Shepherds' Crusade (1320)
The crusade started in May 1320 in Normandy, when a teenage shepherd claimed to have been visited by the Holy Spirit, which instructed him to fight the Moors in Iberia. Similar to the 1251 crusade, this movement included mostly young men, women, and children. They marched to Paris to ask Philip V to lead them, but he refused to meet with them at all. While in Paris they liberated prisoners in the Grand Châtelet.