The name of the tribe means 'servant of the [god] Qays'.Шаблон:Sfn It belonged to the tribal groups originally resident in the area of al-Arid in South Arabia and which migrated northwestward to an area extending north to Sudayr and south to al-Kharj. Later, in the Arab genealogical tradition, these tribes were called the Rabi'a,Шаблон:Sfn a branch of the northern Arab Ma'add confederation.
Campaigns of Shapur II
In pre-Islamic times, the Abd al-Qays frequently raided Iran.[1] The Sasanian king Shapur II (Шаблон:Reign) led an expedition against the Arabian tribes, during which he massacred most of the Abd al-Qays.[1] Later, several Abd al-Qays tribesmen were relocated by Shapur to the Iranian province of Kirman.[1]
Migrations into eastern Arabia
By the 5th century, the Abd al-Qays had shifted to nomadism, dwelling outside of the Tuwaiq escarpment in the southern Najd (central Arabia). In the 6th century, the tribe migrated northeastward the oases of al-Ahsa , Tarout Island and Qatif in eastern Arabia.Шаблон:Sfn
Islamic period
During the Arab conquest of Iran, considerable numbers of Abd al-Qays tribesmen entered southeastern, launching extensive raids in the region.[1] Several groupings of Abd al-Qays settled near Tavvaz in the Iranian coastal mountains and Basra in lower Mesopotamia.[1] In the early 8th century, 4,000 Abd al-Qays warriors formed part of the army of Qutayba ibn Muslim on his campaign into Khorasan.[1]
The majority of the Baharna are descendants of the Banu Abd al-Qays, while some are from the tribes of Bakr ibn Wa'il and others.
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Religion
Abd al-Qays were mostly Christians before the advent of Islam.
