sentences:  The Tanukhids were Christianised in the 3rd or 4th centuries, likely while in the eastern half of the fertile crescent, and by the 4th century they were described as having a "fanatic zeal for Christianity" and were "zealous Christian soldiers" in the 6th century.In the 7th century, during the Muslim conquest of the Levant, the Tanukhids fought with the Romans against the Muslims, including in the Battle of Yarmouk.After Yarmouk, their status as foederati ended.