For the first time, analyses determine that some present-day Kenyans who identify as Swahili are genetically very different from medieval residents of the same region, while others have retained substantial medieval ancestry...The researchers found that the initial waves of newcomers were mainly from Persia. These findings align with the oldest Swahili oral stories, which tell of Persian (Shirazi) merchants or princes arriving on the Swahili shores."It was exciting to find biological evidence that Swahili oral history probably depicts Swahili genetic ancestry as well as cultural legacy," said Esther Brielle, research fellow in genetics in the Reich lab.Brielle is co-first author...