Qays

…up into four tribes—Asad, Taghlib, Qays, and Kinānah—each led by a Kindah prince. The tribes feuded constantly, and, after about the middle of the 6th century, the Kindah princes were forced by the local tribesmen to withdraw once more to southern Arabia.

…southern (Kalb) and northern (Qays) Arab tribes seriously reduced military power.

…favored and indeed used the Qays (North Arabian) tribes. Enmity between the two groups was, therefore, intensified and became an important political factor in Palestine. Pro-Umayyad uprisings were frequent and received Palestinian support. In 840/841 Abū Ḥarb, a Yemenite, unfurled the white banner of the Umayyads and succeeded in recruiting…