Pyrrho

Pyrrho, a Greek philosopher that lived from around 365 BC-360 BC to around 275 BC-270 BC, is usually credited as being the first skeptic philosopher. He traveled with Alexander the Great on his exploration of the east, and came back with his skeptical philosophy, that says apathy[?] (based on the realization that no action can be known to be better than another) is the state with most happiness.

Ataraxia, ‘freedom from worry’, is familiar to us from later Pyrrhonism; this is said by the later Pyrrhonists to be the result of the suspension of judgement that they claimed to be able to induce.