This article explores indigenous notions of power and chiefly legitimacy among the Ihanzu, a relatively small Bantu-speaking community located in north central Tanzania. Particular attention is paid to local ideas and ideals of gender—that is, the cultural categories ‘male’ and ‘female’, as well as the relationship between them—in an effort to show the complex ways in which gender categories, when combined, are powerful and capable of effecting transformations of different sorts. Men and women, by combining male and female fertilising fluids, create children. Similarly, male and female chiefs, through royal incest, bring forth male and female rains. It is suggested that the strategic combination of the cultural categories ‘male’ and ‘female’ provides the underlying transformative model both for sexual reproduction and for rainmaking. And it is through the combination of gender categories that chiefs legitimise their own positions, first by producing rain and, second, by metaphorically giving birth to all Ihanzu people each season. But whether for chiefs or commoners, it is argued that power frequently comes in gendered pairs.