In the Vedic period, society was organized around kinship. The most fundamental unit was the family, known as 'Griha' or 'Kula', headed by the patriarch, the 'Grahapati' or 'Kulapa'. Several families formed a village (Grama), headed by a Gramani. Groups of villages formed a Vis, headed by a Vispati. The highest political unit was the Jana (tribe), ruled by a Rajan.