Thoros (or Theodoros, died March 9, 1098) was the ruler of Edessa at the time of the First Crusade. A former lieutenant of Philaterios Brakamios, he destroyed the Turkish garrison in the city and established himself as ruler. As a Greek Orthodox Christian, he was not well-loved by his Armenian subjects in Edessa. He resisted attacks from the Seljuks, but in 1098 had to ask for help from the crusaders, who were occupied at the siege of Antioch. Baldwin of Boulogne had come to Edessa rather than participate in the siege, probably looking to carve out some territory for himself, and gradually convinced Thoros to adopt him as his son and heir. Shortly afterwards, on March 9, Thoros was assassinated, possibly at Baldwin's command, and Baldwin became the first count of Edessa.