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.
Maarrat al-Nu'man
Those events had a strong impact on the local inhabitants of Southwest Asia. The crusaders already had a reputation for cruelty and barbarism towards Muslims, Jews and even local Christians, Catholic and Orthodox alike (the Crusades began shortly after the Great Schism of 1054).