Call him whatever you want, he was chosen by the people. And that’s the point. He’s a head. But the one to come will not be called a head but a horn.King and emperor are monarchs that are an inherited title. Prime Minister is only the head of the government, not the head of the state.
Hoshea was the last king of Israel from c. 732-724 BC. He became king through a conspiracy in which his predecessor Pekah was killed. 2Kings 15:30; 17:1-6.