The Zainab Tribe tribe is one of the four Ashlander tribes of Morrowind.
The Zainab are the largest, most prosperous, and most settled tribe of Ashlanders - large enough, in fact, that they actually run an ebony mine with which House Hlaalu wish to do business. (An Ashlander-run mine can be found inside the Ghostfence - presumably this is it.) Master Aryon of Tel Vos, the most forward-thinking of the Telvanni lords, also respects them. Living in the settled plains, the Zainab care little about either the Blight or the Nerevarine Prophecies: after all, they have not yet been affected.
On the surface they are as xenophobic as any other Ashlanders, but they hold far more relations with the settled peoples than any of the other tribes, and welcome the bringing of news and trade from the outside. They also respect feats of arms if done in the tribe's service.