Horn of Africa displays the greatest diversity, a sign often viewed to represent a geographic origin. The Horn of Africa is also the place where the haplogroup E1b1b originated from, Christopher Ehret and Shomarka Keita have suggested that the geography of the E1b1b lineage coincides with the distribution of the Afroasiatic languages. Genetic analysis done on the Afroasiatic speaking population further found that a pre-agricultural back-to-Africa migration into the Horn of Africa occurred through Egypt 23,000 years ago and it brought a non-African ancestry dubbed Ethio-Somali in the region. Together with northern Somalia, Djibouti, the Red Sea coast of Sudan and Eritrea is
Horn of Africa to wall paintings of the 7th century CE. Somali architecture includes the Fakr ad-Din Mosque, which was built in 1269 by the Fakr ad-Din, the first Sultan of the Sultanate of Mogadishu. Ethiopia is renowned for its ancient churches, such as at the UNESCO World Heritage Site at Lalibela. The Horn has produced numerous indigenous writing systems. Among these is Ge'ez script ( ') (also known as "Ethiopic"), which has been written in for at least 2000 years. It is an abugida script that was originally developed to write the Ge'ez language. In speech communities that use it, such as