eleutherarch

noun2

1. •
   The leader of the eleutheri.

   • Bruhle introduced him to me as the principal of the university, and the Eleutherarch. — 1813
2. •
   The leader of a secret society, usually mysterious and sinister

   • In contrast to Godwin's Burkean Falkland, however, Ludloe turns out to be a conspirator, a kind of revolutionary eleutherarch straight out of the pages of Robison's Proofs of a Conspiracy. — 2000