AD. Their earliest appearance in records is dated to 473 AD, when their chief Amorkesos signed a treaty with the Byzantine Empire acknowledging their status as foederati controlling parts of Palestine. He apparently became Chalcedonian at this time. By the year 510, the Ghassanids were no longer Miaphysite, but Chalcedonian. Byzantine period The "Assanite Saracen" chief Podosaces that fought alongside the Sasanians during Julian's campaign in 363 might have been a Ghassanid. After originally settling in the Levant, the Ghassanids became a client state to the Byzantine Empire. The Romans found a powerful ally in the Ghassanids who acted as a buffer zone against the Lakhmids. In addition, as kings of their own people, they were also phylarchs, native rulers of client frontier states. The capital was at Jabiyah in the Golan Heights. Geographically, it occupied much of the eastern Levant, and its authority extended via tribal alliances with other Azdi tribes all the way to the northern Hijaz as far south as Yathrib (Medina). Byzantine–Persian Wars The Ghassanids fought alongside the Byzantine Empire against the Persian Sassanids and Arab Lakhmids. The lands of the Ghassanids also continually acted as a buffer zone, protecting Byzantine lands against raids by Bedouin tribes. Among their Arab allies were the Banu Judham and Banu Amela. The Byzantines were focused more on the East and a long war with the Persians was always their main concern. The Ghassanids maintained their rule as the guardian of trade routes, policed Lakhmid tribes and was a source of troops for the imperial army. The Ghassanid king al-Harith ibn Jabalah (reigned 529–569) supported the Byzantines against Sassanid Persia and was given in 529 by the emperor Justinian I, the highest imperial title that was ever bestowed upon a foreign ruler; also the status of patricians. In addition to that, al-Harith ibn Jabalah was given the rule over all the Arab allies of the Byzantine Empire. Al-Harith was a Miaphysite Christian; he helped to revive the Syrian Miaphysite (Jacobite) Church and supported Miaphysite development despite Orthodox Byzantium regarding it as heretical. Later Byzantine mistrust and persecution of such religious unorthodoxy brought down his successors, al-Mundhir (reigned 569–582) and Nu'man. The Ghassanids, who had successfully opposed the Persian allied Lakhmids of al-Hirah (Southern modern-day Iraq), prospered economically and engaged in much religious and public building; they also patronized the arts and at one time entertained the Arabian poets Nabighah adh-Dhubyani