The County of Edessa was a Crusader state established in 1098 during the First Crusade. It was located in the region of modern-day Turkey and was one of the first territories captured by the Crusaders. The county served as a vital outpost for Christian forces in the Holy Land, providing a foothold for further military campaigns. Edessa was known for its diverse population, including Christians, Muslims, and Jews, which contributed to its unique cultural landscape. The county faced numerous challenges, including military threats from surrounding Muslim states. It ultimately fell to the forces of Zengi, the Muslim ruler of Mosul, in 1144, marking a significant setback for the Crusaders.