confederately

History informs us that Egypt and Ethiopia were originally and contemporaneously peopled by the brothers Misraim and Cush, and that they were long confederately governed; and in proof of the truth of this, Herodotus states that down to the time at which he wrote, eighteen out of the list of Egyptian sovereigns recorded, had been Ethiopians.

God's image in ebony : being a series of biographical sketches, facts, anecdotes, etc., demonstrative of the mental powers and intellectual capacities of the Negro race, by edited H.G. Adams 1854