From the reign of Robert, the son of Hugh Capet, the barons of Courtenay are conspicuous among the immediate vassals of the crown; and Joscelin, the grandson of Atho and a noble dame, is enrolled among the heroes of the first crusade.

A domestic alliance (their mothers were sisters) attached him to the standard of Baldwin of Bruges, the second count of Edessa; a princely fief, which he was worthy to receive, and able to maintain, announces the number of his martial followers; and after the departure of his cousin, Joscelin himself was invested with the county of Edessa on both sides of the Euphrates.

By economy in peace, his territories were replenished with Latin and Syrian subjects; his magazines with corn, wine, and oil; his castles with gold and silver, with arms and horses.

In a holy warfare of thirty years, he was alternately a conqueror and a captive: but he died like a soldier, in a horse litter at the head of his troops; and his last glance beheld the flight of the Turkish invaders who had presumed on his age and infirmities.

His son and successor, of the same name, was less deficient in valor than in vigilance; but he sometimes forgot that dominion is acquired and maintained by the same arms.