|Aristophanes of Byzantium|
He invented the colon.
(c257 BC to c185 BC) A Greek grammarian who purportedly invented the Greek accent system used for pronunciation. Some claim that he also invented one of the first punctuation systems: one that used dots to separate verses and to indicate how one should breathe when reading them.
(1) For a short passage (which the Greeks called a komma), a dot was placed mid-level (·) — thus, the origin of the modern comma.
(2) For a longer passage (which the Greeks called a colon), a dot was placed at the bottom of the text (.) — thus, the origin of the modern colon and semicolon.
(3) For very long pauses (which the Greeks called periodos), a dot was placed near the top of the line of text — thus, the origin of the modern period.