The Afar traditions include conversion to Islam from the 7th century onwards. For example, genealogies trace lineages back to ancestors from Arabian Peninsula. Mixtures and circulations between the two shores of the Red Sea and inside the Horn are certain even if we are not able to specify them. According to linguistic analyzes, the Afars and the Saho are the first peoples published in this horn of Africa. Bones and traces of prehistoric peoples can be found in the Afar Region. Their language forms a distinct whole within the Cushitic languages which then split. The Afars are described by Herodotus as being Ethiopian troglodytes living along the Red Sea that the Garamantes hunted. The troglodytes live in caves, the word Afar undoubtedly has a Berber origin, because this word means inhabitant of caves which translates well the troglodyte habitat that Herodotus attributes to them. This word is not attested in the Afar language (referred to as Adal) according to some theories on the etymology of this word. This name may have been given by the Garamante Berbers who named them so because of their troglodyte habitat.