sachemdom means the government or jurisdiction of a sachem. Lexicurio rates it Sui generis — a strength score of 87 out of 100.
Etymology
From sachem + -dom.
noun
- The government or jurisdiction of a sachem.“1821-1822, Timothy Dwight, Travels in New-England and New-York
Alexander , the eldest son of Massasoit , died a young man , and left the Sachemdom to Philip”