Legist

A Legist, from the Latin lex 'law', is any expert or student of law.

It was especially used since the Carolingian dynasty for royal councillors who advised the monarch in legal matters, and specifically helped base its absolutist ambitions on Roman Law. More generally they were teachers of civil or Roman law, who, besides expounding sources, explaining terms, elucidating texts, summarizing the contents of chapters etc., illustrated by cases, real or imaginary, the numerous questions and distinctions arising out of the "Corpus Juris" enactments of the ancient Roman code.