Prehistory
According to Arab tradition, the Semites of South Arabia integrated into Qahtan lineage 40 generations before the Qahtani Yemeni tribe of Jurhum adopted Ismail and 80 generations before Adnan was born, in the 23rd century BCE. After the fall of the Northern Semitic cultures, Qahtan revived the Semitic influence in the North through the famous Kahlan (Azd and Lakhm) and other Yemenite tribes migration into the North during the 3rd century CE after the first destruction of the Marib Dam. The Horn of Africa's first Semitic nation, Dʿmt, was a Yemeni settlement.
The Qahtani Semites remained dominant in Yemen from 2300 BCE to 800 BCE, but little is known about this era because the Semites of the South were separated by the vast Arabian desert from Mesopotamian Semites and they lacked any type of script to record their history. However, it is known that they actively traded along the Red Sea coasts. This led to contact with the Phoenicians and from them, the Southern Semites adopted their writing script in 800 BCE and began recording their history.
The Tihama Semitic culture lasted from 1500-1200 BCE. During the late 2nd millennium BCE, a cultural Semitic complex arose in the Tihama region of Yemen and spread to northern Ethiopia and Eritrea (specifically the Tigray Region, central Eritrea, and coastal areas like Adulis). The Semites of Yemen began settling the Ethiopian highlands. These settlements would reach their climax by the 8th century BCE, eventually giving rise to the Dʿmt and Aksum kingdoms
Read more about this topic: History Of Yemen