The 'Uqayl branch moved southwards and settled in the large valley known as "al-'Aqiq" (modern day Wadi al-Dawasir), which they later claimed was granted to them by the prophet of Islam Muhammad.
Another section of the Uqayl, possibly coming from Iraq, according to ibn Khaldun, took over the deserts of eastern Arabia, around al-Ahsa Oasis.
In the mid-13th centuries, one Uqaylid clan leader, Usfur ibn Rashid, deposed the Uyunids, and founded the Usfurids, which lasted until 1330.
Ajwad's elder brother established the dynasty in the early 15th century by deposing and killing the last Jarwanid ruler in Qatif.
At their height, the Jabrids controlled the entire Arabian coast on the Persian Gulf, including the islands of Bahrain, and regularly led expeditions into central Arabia.