Formation of the Ichongo–Ipusu Segmentary Lineage System

Tiv genealogy traces every clan to two founding lines, Ichongo and Ipusu, descended from the ancestor Tiv's two sons — the basis of the Tiv segmentary lineage system studied by anthropologists as a classic West African example.

All Tiv people are understood, genealogically, to belong to one of two great lineages: Ichongo ('circumcised') or Ipusu ('uncircumcised'), named for the two sons of the ancestor Tiv. These lineages subdivide repeatedly into major and minor branches down to the ipaven, the smallest kin-based residential unit. This structure — a single vast patrilineage governing land rights, social organization and conflict resolution without centralized chieftaincy — made the Tiv the best-documented West African case study of a segmentary lineage system in 20th-century anthropology.

The segmentary lineage system shaped Tiv political organization long before (and alongside) colonial administration, and directly explains why British indirect rule — designed for centralized chieftaincies — struggled to take hold in Tivland.

• Ichongo lineage\nIpusu lineage