Arab Christian client kingdom of the Byzantine Empire, originating from South Arabian migrants, serving as foederati defending Byzantium's eastern frontier against Bedouin raids and the rival Lakhmid-Sasanian alliance.
Defeated at the Battle of the Yarmuk in 636 CE alongside the Byzantine army; Arab-Muslim forces of the Rashidun Caliphate absorbed the Ghassanid territory by 638 CE, ending the dynasty's formal authority.
The definitive scholarly treatment of the Ghassanids as Byzantine foederati, drawing on Arabic, Greek, and Syriac sources; published by Dumbarton Oaks Research Library; confirmed via multiple review sources.
Era/regional study of the client-king system through which Byzantium maintained Arab foederati like the Ghassanids on its eastern frontier.