Banu Kalb
From their then-settlement in southern Palestine (which they still occupied even during the Muslim conquest of the Levant), for centuries Banu 'Amilah acted as foederati for the Byzantines against any possible threats from the tribes of the Arabian peninsula and the Persian-allied Lakhmids. They are believed to have settled in the area, possibly in the 3rd or 4th century, after moving from Iraq and through Palmyra. They were noted for their strong commitment to the Empire in the 6th century and acknowledged Ghassanid supremacy among the Arab foederati. They were closely linked with the neighbouring Banu Judham and allied to Banu Kalb. The tribe was among the Arab foederati, who, alongside the Byzantine Empire, opposed the initial Muslim incursions into the Levant.