The County of Edessa (Latin: Comitatus Edessanus) was a 12th-century Crusader state in Upper Mesopotamia. Its seat was the city of Edessa (modern Şanlıurfa, Turkey).
In the late Byzantine period, Edessa became the centre of intellectual life within the Syriac Orthodox Church. As such it also became the centre for the translation of Ancient Greek philosophy into Syriac, which provided a stepping stone for the subsequent translations into Arabic. When the Crusades arrived, it was still important enough to tempt a side-expedition after the siege of Antioch.
Baldwin of Boulogne, the first Count of Edessa, became King of Jerusalem, and subsequent counts were his cousins. Unlike the other Crusader states, the county was landlocked. It was remote from the other states and was not on particularly good terms with its closest neighbor, the Principality of Antioch. Half of the county, including its capital, was located east of the Euphrates, far to the east, rendering it particularly vulnerable. The west part of the Euphrates was controlled from the stronghold of Turbessel. The eastern border of Edessa was the Tigris, but the County may not have extended quite that far.
The fall of Edessa in 1144 was the first major setback for Outremer and provoked the Second Crusade. All the later Crusades, however, were troubled by strategic uncertainties and disagreements. The Second Crusade did not even try to recover Edessa, calculating it to be strategically better to take Damascus. But the campaign failed and Edessa was lost for the Christians.
History of Edessa
Founding
In 1098, Baldwin of Boulogne left the main Crusading army, which was travelling south towards Antioch and Jerusalem. He went first south into Cilicia, then east to Edessa, where he convinced its lord, Thoros, to adopt him as son and heir. He also married Thoros' daughter, Arda of Armenia, who eventually became the first queen of Jerusalem. Thoros was a Christian of Armenian origin but of Greek Orthodox religion and largely disliked by his Armenian Orthodox subjects, which led to his removal from power in March 1098. Different sources claim he was assassinated or abdicated, but it is unknown if Baldwin had any part in this. Nonetheless, Baldwin succeeded Thoros as ruler, taking the title of count (having been Count of Verdun as a vassal of his brother in Europe).
In 1100, Baldwin became King of Jerusalem when his brother, Godfrey of Bouillon, died. The County of Edessa passed to his cousin Baldwin of Bourcq. He was joined by Joscelin of Courtenay, who became lord of the fortress of Turbessel on the Euphrates, an important outpost against the Seljuk Turks.
The Frankish lords formed a good rapport with their Armenian subjects, and there were frequent intermarriages; the first three counts all married Armenians. Count Baldwin's wife had died in Marash in 1097, and after he succeeded to Edessa he married Arda, a granddaughter of the Armenian Roupenid Prince Constantine. Baldwin of Bourcq married Morphia, a daughter of Gabriel of Melitene, and Joscelin of Courtenay married a daughter of Constantine.
Conflicts with Muslim neighbours
Baldwin II quickly became involved in the affairs of northern Assyria and Asia Minor. He helped secure the ransom of Bohemond I of Antioch from the Danishmends in 1103, and, with Antioch, attacked the Byzantine Empire in Cilicia in 1104. Later in 1104, Edessa was attacked by Mosul, and both Baldwin and Joscelin were taken prisoner after their defeat at the Battle of Harran. Bohemond's cousin Tancred became regent in Edessa (although Richard of Salerno actually governed the territory), until Baldwin and Joscelin were ransomed in 1108. Baldwin had to fight to regain control of the city; Tancred was eventually defeated, though Baldwin had to ally with some of the local Muslim rulers.
In 1110, all lands east of the Euphrates were lost to Mawdud of Mosul. This was not followed by an assault on Edessa itself as the Muslim rulers were more concerned with consolidating their own power.
Baldwin II became King of Jerusalem (also as Baldwin II) when Baldwin I died in 1118. Although Eustace of Boulogne had a better claim as the late Baldwin's brother, he was in France and did not want the title. Edessa was given to Joscelin in 1119. Joscelin was taken prisoner once again in 1122; when Baldwin came to rescue him, he too was captured, and Jerusalem was left without its king. Joscelin escaped in 1123, and obtained Baldwin's release the next year.