The AbbasidsPeriod 750- 969 AD   

A powerful earthquake rocked Jordan in 747AD, destroying many buildings and perhaps contributing to the defeat of the Umayyads by the Abbasids three years later. The Abbasids established their capital in Baghdad, leaving Jordan a provincial backwater far from the center of the empire. The Desert Castles were abandoned, and Jordan now suffered more from benign neglect than from the attentions of invading armies. However, recent excavations have shown that the population of Jordan continued to increase, at least until the beginning of the 9th century AD.