Thoros of Marash was the father of Arda of Armenia

Arda of Armenia

Arda was the wife of King Baldwin I of Jerusalem. She was the first Queen consort of the Kingdom of Jerusalem, as Baldwin's brother and predecessor Godfrey of Bouillon was unmarried....

, the first queen consort of the Kingdom of Jerusalem.

Thoros' allowing Baldwin I of Jerusalem

Baldwin I of Jerusalem

Baldwin I of Jerusalem, formerly Baldwin I of Edessa, born Baldwin of Boulogne , 1058? – 2 April 1118, was one of the leaders of the First Crusade, who became the first Count of Edessa and then the second ruler and first titled King of Jerusalem...

, who was then Count of Edessa

County of Edessa

The County of Edessa was one of the Crusader states in the 12th century, based around Edessa, a city with an ancient history and an early tradition of Christianity....

 to marry his daughter gave Baldwin a legitimate claim to Edessa since it was within the traditional area of Armenia.

Thoros failed to pay the full dowry he had pledged. Also with Baldwin becoming King of Jerusalem, he no longer felt a need to have alliances with the Armenians. Baldwin had his marriage to Arda annulled. About the same time the forces of Edessa drove Thoros from his domain. He was then forced to flee to Constantinople

Constantinople

Constantinople was the capital of the Roman, Eastern Roman, Byzantine, Latin, and Ottoman Empires. Throughout most of the Middle Ages, Constantinople was Europe's largest and wealthiest city.-Names:...

and became part of an anti-Crusader faction in Constantinople advocating that the Byzantine Empire reassert its traditional hold on Armenian territories that were now held by the Crusader States.