(450 AD) Aelius Donatus was a Roman grammarian, teacher of rhetoric, and tutor of St. Jerome. His Ars grammatica became an extremely popular schoolbook, so much so that in the Middle Ages the eponym donet came to denote an introductory textbook of any sort.

He also championed a primordial punctuation system — which probably derives from the one invented by Aristophanes of Byzantium — consisting of dots placed in three different positions to show different pause lengths. These dots evolved into the modern comma, colon, and period.

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