Forming a number of small communities, each led by a Djermakoy, these polities soon found themselves pressured from the north by the Tuareg and the Fula from the southeast, as well as other ethnic groups in the area.

While Djermakoy Aboubacar founded the Dosso state from his own Taguru clan around 1750, it remained a small collection of villages in the Dallol Bosso valley until the 1820s, when it led much of the resistance to the Sokoto Caliphate.

While Dosso fell under the control of the Amir of Gando (a sub division of Sokoto) between 1849 and 1856, they retained their Djermakoy and the nominal rule of a much larger Djerma territory, and were converted to Islam.

Under Djermakoy Kossom (r. 1856-65), Dosso united all of the eastern Djerma, and left a small state stretching from Tibbo and Beri in the north, to Gafiadey in the south, and to Bankadey and Tombokware in the east.

At Dosso, the French allowed the Zarmakoy to not only retain but expand his territory and to choose his own successors, keeping continuity with the pre-colonial state, and standing above his own Chefs du Canton at the local level.