The Southern Yemeni Arabs of Yemen, numbering approximately 12,190,000 people, are Engaged yet Unreached. They are a Hadhrami Arab people of an ancient South Arabian kingdom that flourished on the incense trade route linking Arabia, Mesopotamia, East Africa, and Rome until its conquest by Saba in the third century AD, later renowned for a far-reaching diaspora. They mostly adhere to Sunni Islam and Ta'izzi-Adeni Arabic is their primary language.