The two groups of ancestors of Arabia are the Adnanians and the Qahtanians.
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The Adnanians and Qahtanians are two major tribes in the Arabian Peninsula, primarily associated with the broader Arab ethnic groups. The Adnanians are traditionally linked to northern and central Arabia, including areas like Mecca and Medina, while the Qahtanians are often associated with southern Arabia, particularly regions in Yemen. Both tribes represent significant cultural and historical aspects of Arab heritage, with roots tracing back to the early Islamic period and earlier.
they left because there were three other tribes around the same area at the same time and the fight for land and resources was becoming scarce so they left to find better living standeres