A-ca-oo-mah-ca-ye

[2] The first Aka-Omahkayii (d. January 1795) was described by Duncan M'Gillivray, the North West Company clerk at Fort George, as "once the greatest Cheif [sic] of this Nation and was respected and esteemed by all neighboring tribes.

[8][9] By contrast, Big Man was openly hostile to other tribes and European traders, going so far as to participate in the 1793 Gros Ventre attack on the Hudson Bay Company's Manchester House.

[10] In 1800, Aka-Omahkayii allowed the Hudson's Bay Company to establish the Chesterfield House trading post within the Blackfoot's wintering grounds at the confluence of the Red Deer and South Saskatchewan Rivers.

[4][11] Around 1801, the Aka-Omahkayii drew for Hudson Bay Company surveyor Peter Fidler a detailed map of the lands around the Upper Missouri, including names of rivers, mountains, and peaks and travel time between them and information about 32 tribes populating the region.

He was described in 1858 by Dr. James Hector as one of the three principal chiefs of the Blackfoot Confederacy (the other two being Crowfoot and Na-to-sa-pi[18]), and, in July 1859, the Palliser Expedition were guests at his encampment on the Red Deer River.