Usually labeled the “President” or “Prime Minister”, this role is the leader of your nation-state.
This position is responsible for the financial and military position of the Nation-State your running.
The HOS typically stays at the Nations Table during the game. This allows other Ambassadors, Deputy Heads of States or occasionally another Head of State to come and discuss something with you directly.
Link to the LIVE HOS Player Manual (Google Doc file being constantly updated)