Which crusader state was centered on the city of Edessa?

Which crusader state was centered on the city of Edessa? The County of Edessa was the crusader state centered on the city of Edessa.

The County of Edessa was established during the First Crusade in the early 12th century. Baldwin of Boulogne took control of Edessa in 1098, before Jerusalem was captured, making it the first of the major Crusader states created in the eastern Mediterranean and Upper Mesopotamia.

Its capital, Edessa—modern Şanlıurfa in southeastern Turkey—stood in a strategically important region linking northern Syria, Anatolia, and Mesopotamia. The county included a mixture of Latin, Armenian, Greek, Syriac, and Muslim communities, so its rulers governed a culturally and religiously diverse population.

The County of Edessa was also the most vulnerable Crusader state because it lay farthest inland and was surrounded by powerful Muslim states. Zengi, the ruler of Mosul and Aleppo, captured Edessa in 1144. The loss helped prompt the Second Crusade, although the county itself was never permanently restored.