"Priscianus Caesariensis (fl. AD 500), commonly known as Priscian (/ˈprɪʃən/ or /ˈprɪʃiən/), was a Latin grammarian and the author of the Institutes of Grammar, which was the ...
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standard textbook for the study of Latin during the Middle Ages. It also provided the raw material for the field of speculative grammar." - (en.wikipedia.org 18.10.2022)