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.
Crusades (TV series)
The first episode recounts Byzantine Emperor Alexius's appeal to Pope Urban II for help in fighting Muslim Turks, the first crusaders as they neared Jerusalem, and the first casualties of The Crusades: Jews massacred in Worms and Cologne.