According to Plin. HN 6,158 a people in the interior of southern Arabia, which has not been successfully identified. It may be derived from the name of the modern town of Ḏamār, to the southeast of Ṣana'a. In Plinius the two (also unlocated) cities of Sagiatta and Canthace are classed as theirs. The context suggests that the Z. lived in the territory of the Homeritae at Sapphar (Ẓafār).
E. Glaser, Skizze der Gesch. und Geogr. Arabiens, vol. 2, 1890 (repr. 1976), 136, 142 f.
J. Pirenne, Le Royaume Sud Arabe de Qataban et…