A person who remains calm in the face of pain of misfortune is called?

In the context of Ancient Greece (but it is often true in other contexts, as well), a person who remains calm in the face of pain or misfortune eventually came to be known as a "Stoic. " The teachings of the Stoics held that the best human response to adversity is to accept adversity as natural and unavoidable: remaining calm when it strikes is just one way to remain in control (and to achieve happiness) during tough times in life.