Sister-wife of Manco Cápac and first Coya (Inca queen). Mother of Sinchi Roca, the second Sapa Inca. The imperial Inca sister-marriage convention originates with the Manco Cápac / Mama Ocllo founding pair: each Sapa Inca took his full sister as Coya (principal wife), maintaining the divine-genealogical purity from the Inti/Mama Killa progenitor pair through the imperial line. Mama Ocllo's civilizing-arts instruction of women (weaving, spinning, household craft) is the female complement to Manco Cápac's instruction of men in agriculture and stonework — the foundational gendered division of Inca state ideology, and the pattern explicitly cited by Guaman Poma as the basis for the structural separation of women's and men's labor-and-tribute (mit'a) categories under the imperial system.