Main branches of Qais
The main branches of the Qais tribes are the Banu Sulaym, Hawazin and the Banu Ghatafan. These three main groups remained in the Eastern Hejaz until the 7th century. They first fought the Ansari and Qurayshi Muslims, but converted to Islam after their defeat in the Battle of Hunayn. The Qaysis branched into more subgroups during the Umayyad Caliphate.
The rivalry between Qais and the Banu Kalb, which was extended to the "North Arab" (Qais-led) versus "South Arab" or "Yemeni" (Kalb-led) tribal supergroups, became firmly established after the Battle of Marj Rahit (684).
Battles between the Azdi Muslim Ansar and the Qais, then pagan tribes of Arabia will continue until the 18th century in battles fought between them regardless of religious affiliations in Tunisia, Sicily, Syria, Lebanon and Spain.
Qais and Islam
In the pre-Islamic times Qais tribes were known to be a Notorious threat to Caravans passing Nejd or Hijaz. Quresh paid them an annual third of its date harvest to help eliminate the Muslims in Yathrib.
Sack of Al Qudr 624 AD
Battle of Ahzab 627 AD
The Qais tribes were the second major contributor in manpower to the Battle of Ahzab behind Quraysh.
Battle of Khaybar 629 AD
The Muslims marched against the Jewish Fortress, so the Jews called upon their allies to come aid them against the Muslims. Approximately 4,000 Ghatafani fighters marched towards Khaybar. However, The Banu Ghatafan experienced a paranormal experience, according to Islamic tradition. So The Ghatafan tribes feared that their families were threatened and returned home to find their families surprised to see them.