What is "ghassanids"

The Ghassanids (; al-Ghasāsinah, also Banū Ghassān "Sons of Ghassān") were a group of Arabs, descended from the Azd tribes, that emigrated in the early 3rd century from the Southern Arabian Peninsula to the Levant region, where some merged with Greek-speaking Christians' communities, converting to Christianity in the first few centuries AD while others were already Christians before emigrating north to escape religious persecution. Few Ghassanids became Muslim following the Islamic Conquest; most Ghassanids remained Christian and joined Melkite and Syriac communities within what is now Jordan, Palestine, Syria and Lebanon.

After settling in the Levant, the Ghassanids became a client state to the Eastern Roman (Byzantine) Empire and fought alongside the Byzantine Empire against the Persian Sassanids and Arab Lakhmids. The lands of the Ghassanids also acted as a buffer zone protecting lands that had been annexed by the Romans against raids by Bedouin tribes.