On being ransomed he went to Constantinople,where was held the court of his cousin,the emperor Manuel, with whom he was a great favourite.
He lost the two days' battle of Kossovo (October 17th-19th) owing to the treachery of Dan, hospodar of Wallachia, and of his old enemy Brankovic, who imprisoned him for a time in the dungeons of the fortress of Semendria; but he was ransomed by the Magyars, and, after composing his differences with his powerful and jealous enemies in Hungary, led a punitive expedition against the Servian prince, who was compelled to accept most humiliating terms of peace.
In the Toth century IIushiel, one of four prisoners, perhaps from Babylonia, though that is doubtful, was ransomed and settled at Kairawan, where he acquired great reputation as a Talmudist.
Shortly afterwards he was ransomed, and returned to Provence in 1250.
If ransomed, the victim became by Athenian law the slave of his redeemer till he paid in money or labour the price which had been given for him.