The Ghassanids remained a Byzantine vassal state until its rulers and the eastern Byzantine Empire were overthrown by the Muslims in the 7th century, following the Battle of Yarmuk in 636 AD.
At the time of the Muslim conquest the Ghassanids were no longer united by the same Christian faiths: some of them accepted union with the Byzantine Chalcedonian church; others remained faithful to Miaphysitism and a significant number of them maintained their Christian religious identity and decided to side with the Muslim armies to emphasize their loyalty to their Arabic roots and in recognition of the wider context of a rising Arab Empire under the veil of Islam.
It is worth noting that a significant percentage of the Muslim armies in the Battle of Mu'tah (معركة مؤتة) were Christian Arabs.
Several of those Christian Arab tribes in today's modern Jordan who sided with the Muslim armies were recognized by exempting them from paying jizya (جزية).
Jizya is a form of tax paid by non-Muslims – Muslims paid another form of tax called Zakah (زكاة).
 Later those who remained Christian joined Melkite Syriac communities.
 The remnants of the Ghassanids were dispersed throughout Asia Minor.
The Ghassanids remained a Byzantine vassal state until its rulers and the eastern Byzantine Empire were overthrown by the Muslims in the 7th century, following the Battle of Yarmuk in 636 AD. At the time of the Muslim conquest the Ghassanids were no longer united by the same Christian faiths: some of them accepted union with the Byzantine Chalcedonian church; others remained faithful to Miaphysitism and a significant number of them maintained their Christian religious identity and decided to side with the Muslim armies to emphasize their loyalty to their Arabic roots and in recognition of the wider context of a rising Arab Empire under the veil of Islam. It is worth noting that a significant percentage of the Muslim armies in the Battle of Mu'tah (معركة مؤتة) were Christian Arabs. Several of those Christian Arab tribes in today's modern Jordan who sided with the Muslim armies were recognized by exempting them from paying jizya (جزية). Jizya is a form of tax paid by non-Muslims – Muslims paid another form of tax called Zakah (زكاة).  Later those who remained Christian joined Melkite Syriac communities.  The remnants of the Ghassanids were dispersed throughout Asia Minor.
Ghassanids