This has historical consistency with cultural accounts of Makeda, the Ethopian tale of the Queen of Sheba n in depth study into human origins (Schlebusch et al doi: 10.1126/science.1227721, doi:10.1126/science.aao6266) estimates, using ancient and modern genome data, including the benchmark genome of a boy from Southern Africa 2000 years ago, found that originated as a genetically distinct species between 350,000 and 260,000 years ago.
A genetic split between the Khoisan and other Africans occurred roughly 260,000 years ago, shortly after humankind's origins and around the time of the Florisbad individual.
The insertions and deletions of the million or so Alu elements in the human genome (p 332) are particularly useful, as the most active sub-population of about 1000 Alu is actively transcribing and undergoing rapid change.
A subpopulation of Alu are capable of generating new coding regions (exons), when inserted into non-coding introns between spliced sections of a translated m RNA, because one base-pair change within Alu leads to formation of a new exon reading into the surrounding DNA.
Our divergence from other primates may thus be due in part to alternative splicing.
Fig 29g: Left: Southern African ancient genomes estimate modern human divergence to 350,000 years ago, with a genetic split between the Khoisan and other Africans 260,000 years ago, shortly after humankind's origins and around the time of the Florisbad individual.