Ankole (Nkole) is a large kingdom in southwestern Uganda, where the pastoralist Hima established dominion over the agricultural Iru some time before the nineteenth century. The Hima and Iru established close relations based on trade and symbolic recognition, but they were unequal partners in these relations. The Iru were legally and socially inferior to the Hima, and the symbol of this inequality was cattle, which only the Hima could own. The two groups retained their separate identities through rules prohibiting intermarriage and, when such marriages occurred, making them invalid.

The Hima provided cattle products that otherwise would not have been available to Iru farmers. Because the Hima population was much smaller than the Iru population, gifts and tribute demanded by the Hima could be supplied fairly easily. These factors probably made Hima-Iru relations tolerable, but they were nonetheless reinforced by the superior military organization and training of the Hima.

The kingdom of Ankole expanded by annexing territory to the south and east. In many cases, conquered herders were incorporated into the dominant Hima stratum of society, and agricultural populations were adopted as Iru or slaves and treated as legal inferiors. Neither group could own cattle, and slaves could not herd cattle owned by the Hima.

Ankole society evolved into a system of ranked statuses, where even among the cattle-owning elite, patron-client ties were important in maintaining social order. Men gave cattle to the king (mugabe) to demonstrate their loyalty and to mark life-cycle changes or victories in cattle-raiding. This loyalty was often tested by the king's demands for cattle or for military service. In return for homage and military service, a man received protection from the king, both from external enemies and from factional disputes with other cattle owners.

The mugabe authorized his most powerful chiefs to recruit and lead armies on his behalf, and these warrior bands were charged with protecting Ankole borders. Only Hima men could serve in the army, however, and the prohibition on Iru military training almost eliminated the threat of Iru rebellion. Iru legal inferiority was also symbolized in the legal prohibition against Iru owning cattle. And, because marriages were legitimized through the exchange of cattle, this prohibition helped reinforce the ban on Hima-Iru intermarriage. The Iru were also denied highlevel political appointments, although they were often appointed to assist local administrators in Iru villages.

The Iru had a number of ways to redress grievances against Hima overlords, despite their legal inferiority. Iru men could petition the king to end unfair treatment by a Hima patron. Iru people could not be subjugated to Hima cattle-owners without entering into a patron-client contract.

A number of social pressures worked to destroy Hima domination of Ankole. Miscegenation took place despite prohibitions on intermarriage, and children of these unions (abambari) often demanded their rights as cattle owners, leading to feuding and cattle-raiding. From2d7 om what is present-day Rwanda, groups launched repeated attacks against the Hima during the nineteenth century. To counteract these pressures, several Hima warlords recruited Iru men into their armies to protect the southern borders of Ankole. And, in some outlying areas of Ankole, people abandoned distinctions between Hima and Iru after generations of maintaining legal distinctions that had begun to lose their importance.

Data as of December 1990