"The tribe of Shammar (Arabic: شَمَّر) is a tribal Arab Qahtanite confederation, descended from the ancient Yemeni tribe of Tayy. It is one of the largest ...
and most influential Arab tribes. The historical and traditional seat of the tribe´s leadership is in the city of Ha´il in what was the Emirate of Jabal Shammar in Saudi Arabia. In its "golden age", around 1850, the tribe ruled much of central and northern Arabia from Riyadh to the frontiers of Syria and the vast area known as Al Jazira in Northern Iraq.
One of the early famous figures from the tribe was the legendary Hatim Al-Ta´i (Hatim of Tayy; died 578), a Christian Arab renowned for generosity and hospitality who figured in the Arabian Nights. The early Islamic historical sources report that his son, Adiyy ibn Hatim, whom they sometimes refer to as the "king" of Tayy, converted to Islam before Muhammad´s death. Another figure from Tayy during this period was Zayd al-Khayr, a prominent member of Tayy who is said to have led Tayy´s delegation to Muhammad accepting Islam." - (en.wikipedia.org 17.03.2020)