I mean if you wanna go that far into it, the Choctaw didn't have a typical hereditary monarchy before 1860. They would have three chiefs/kings that were chosen by popular consensus, and sometimes it would be hereditary, but often it wasn't. And they didn't have absolute monarchy either where the chiefs had complete authority. They've been a republic with a constition since 1860, which is around when my fictional ancestor was supposedly alive so even the line of succession thing doesn't work