Sabaean, also known as Sabaic, was an Old South Arabian language spoken between c. 1000 BC and the 6th century AD, by the Sabaeans. It was used as a written language by some other peoples of ancient civilization of South Arabia, including the Ḥimyarites, Ḥashidites, Ṣirwāḥites, Humlanites, Ghaymānites, and Radmānites. The Sabaean language belongs to the South Arabian Semitic branch of the Afroasiatic language family. Sabaean is distinguished from the other members of the Old South Arabian group by the use of h to mark the third person, and as a causative prefix; the other languages all use s1 in these cases; Sabaean is therefore called an h-language, and the others s-languages.