The scholia to the canonical manuscripts of the Collection in Fifty Titles and Collection in Fourteen Titles serve as an excellent case study in the potentials of marginalia to illuminate historical narratives and broaden our understanding of how the Byzantines encountered and read their traditional texts. This article explores these potentials by a) offering an overview and taxonomy of the canonical scholia; b) (re)discovering a Macedonian ‘proto-commentator’ hiding in plain sight in the margins of one manuscript; c) sketching some of the scholia's hermeneutic particularities in comparison to the twelfth-century canonical commentaries.