Damocles is the Emperor and head of the human army. He serves as the main antagonist of Of Orcs and Men. He is at least the second emperor of the human empire his father who ruled before him.
His name may be a reference to the term "Damocles sword", which means a constant danger and can strike at any time.
We know he has a son, a minor, which should have the throne to his death, but the prince was removed from power by Barimen.