After the family, the next largest social units were the subclan and clan. These units were derived from groups claiming patrilineal descent from a common ancestor, ranked in order of seniority (the "conical clan"). By the Chingissid era this ranking was symbolically expressed at formal feasts, in which tribal chieftains were seated and received particular portions of the slaughtered animal according to their status. The lineage structure of Central Asia had three different modes. It was organized on the basis of genealogical distance, or the proximity of individuals to one another on a graph of kinship; generational distance, or the rank of generation in relation to a common ancestor, and birth order, the rank of brothers in relation to each another. The paternal descent lines were collaterally ranked according to the birth of their founders, and were thus considered senior and junior to each other. Of the various collateral patrilines, the senior in order of descent from the founding ancestor, the line of eldest sons, was the most noble. In the steppe, no one had his exact equal; everyone found his place in a system of collaterally ranked lines of descent from a common ancestor. It was according to this idiom of superiority and inferiority of lineages derived from birth order that legal claims to superior rank were couched.