1. What is a coup and what is coup d'etat a French term meaning?​

blow of state

A coup d'état (/ˌkuːdeɪˈtɑː/ ( listen); French for "blow of state") or coup is the removal and seizure of a government and its powers. Typically, it is an illegal, unconstitutional seizure of power by a political faction, the military, or a dictator.

A Coup d'etat is simply the overthrowing of the government, or rather,  seizing  of its power, usually through military force. Put simply, a revolt if you will. The term Coup d'etat is French for "blow of state."

the birthmark on georgiana's face alludes to the doctrine of "original sin," being tainted with evil from birth