The leader of a Fremen sietch, whose authority was maintained through demonstrated strength and wisdom. A Naib could be challenged for leadership through personal combat to the death, ensuring that only the most capable individuals led each community. The Naib oversaw water distribution, led raids, planned sietch expansion, and served as the final arbiter of disputes. When Paul Muad'Dib established himself among the Fremen, he carefully preserved the autonomy of individual Naibs while assuming spiritual and military leadership over the broader Fremen nation.