The Tarasin tribes known as Irstats were inhabitants of the planet Cularin. While an Irstat typically numbered roughly thirty to fifty individuals, certain irstats were more expansive; for instance, the Hiironi irstat, the largest of these groups, boasted a population exceeding three hundred. Leadership within each irstat was provided by an Irstat-Kes, generally the tribe's second oldest female member. The oldest female within the irstat was given the title "Mother" and functioned as a symbolic representation of the tribe, personifying the most esteemed qualities of Tarasin culture. Although not a requirement, both Mothers and Irstat-Kes' often demonstrated abilities as Force Adepts.