The Rome That Did Not Fall: The Survival of the East in the Fifth Century, Gerard Friell, pp. 107, Psychology Press, 1998, ISBN 978-0-415-15403-1, ... Recent archaeological work has suggested that the strongest period of fortification and garrison on the Limes Arabicus was in the fourth and fifth centuries. We have numerous references to raiding of settled areas by Arab tribes from the desert ...
The Middle of the Earth, Allen Austin, pp. 118, Xulon Press, 2011, ISBN 978-1-61215-912-6, ... Arab genealogies usually ascribe the origins of the Qahtanites to the South Arabians who built up one of the oldest centres of civilisation in the Near East beginning around 800 BC ...
