In the 11th century, the Islamic world faced the Crusader danger at an unexpected time. Europeans wanted to expel Turks from Anatolia, who began conquering Anatolia from 1071 and gradually seized a large part of Anatolian lands and began to gradually tighten the lands of the Byzantine Empire. The war was inevitable as they wanted to drive the Turks out of Anatolia, take advantage of the wealth of the Islamic world and take over the holy lands. These wars which started in 1096, were named Crusades,. The throne fights that started after the death of the Great Seljuk Sultan Melikshah in 1092 greatly shook the central authority of the state and the Seljuks were caught unprepared for the Crusades, which started in 1096. The Berkyaruk-Muhammed Tapar struggle did not leave time to deal with the Crusaders, and the central authority of the state was shaken for a long time. When Berkyaruk died in 1104, Muhammed Tapar, who sat alone on the throne, continued to fight the Crusaders on the Syrian territory relentlessly. In the Anatolian territory, initially Kılıç Arslan I and later Mesud I continued this struggle. The Crusaders started to come to Anatolia in large crowded armies since 1096 and established the County of Edessa in Urfa on 10 March 1098 and The Principality of Antioch on 03 June 1098. The Crusaders continued their way and reached Jerusalem, which they deemed holy, and established the Kingdom of Jerusalem on July 15, 1099. The Seljuks made great struggles to demolish the County of Edessa and continued this struggle until the end with the help of Mosul and Aleppo Atabegs and Zangids.
the Seljuks, the Zangid, the Artuqids, the Mosul and Aleppo Atabegs, the County of Edessa