The following are the rights and privileges of the typical Indian gens, according to Morgan: "All the members of an Iroquois gens were personally free, and they were bound to defend each other's freedom; they were equal in privileges and in personal rights, the sachems and chiefs claiming no superiority; and they were a brotherhood bound together by ties of kin. Liberty, equality and fraternity, though never formulated, were cardinal principles of the gens. These facts are material, because the gens was the unit of a social and governmental system, the foundation upon which Indian society was organized. A structure composed of such units would of necessity bear the impress of their character, for as the unit, so the compound. It serves to explain that sense of independence and personal dignity universally an attribute of Indian character." At the time of the discovery the Indians of entire North America were organized in gentes by maternal law. Only "in some tribes, as among the Dakotas, the gentes had fallen out; in others as among the Ojibwas, the Omahas and the Mayas of Yucatan, descent had been changed from the female to the male line." Among many Indian tribes with more than five or six gentes we find three, four or more gentes united into a separate group, called phratry by Morgan in accurate translation of the Indian name by its Greek equivalent. Thus the Senecas have two phratries, the first comprising gentes one to four, the second gentes five to eight. Closer investigation shows that these phratries generally represent the original gentes that formed the tribe in the beginning. For the marriage interdict necessitated the existence of at least two gentes in a tribe in order to realize its separate existence. As the tribe increased, every gens segmented into two or more new gentes, while the original gens comprising all the daughter gentes, lived on in the phratry. Among the Senecas and most of the other Indians "the gentes in the same phratry are brother gentes to each other, and cousin gentes to those of the other phratry"--terms that have a very real and expressive meaning in the American system of kinship, as we have seen. Originally no Seneca was allowed to marry within his phratry, but this custom has long become obsolete and is now confined to the gens. According to the tradition among the Senecas, the bear and the deer were the two original gentes, from which the others were formed by segmentation. After this new institution had become well established it was modified according to circumstances. If certain gentes became extinct, it sometimes happened that by mutual consent the members of one gens were transferred in a body from other phratries. Hence we find the gentes of the same name differently grouped in the phratries of the different tribes.