1) Arab dynasty 
The Usfurids were an Arab dynasty that in 1253 gained control of eastern Arabia, including the islands of Bahrain, They were a branch of the Banu Uqayl tribe of the Banu Amir group, and are named after the dynasty’s founder, Usfur ibn Rashid. They were initially allies of the Qarmatians and their successors, the Uyunids, but eventually overthrew...