scholiast

One of the ancient commentators who annotated the classical authors.

One who makes scholia; a commentator; an annotator; especially, an ancient grammarian who annotated the classics.

A maker of scholia; a commentator or annotator.

A scholar who writes commentaries on the works of an author, especially one of the ancient commentators of classical authors.

a scholar who writes explanatory notes on an author (especially an ancient commentator on a classical author)