Eriugena's Theory of Light and its Hexaemeral Sources: Rethinking Eriugena's Knowledge of the Greek Patristic Corpus - Katsos, Isidoros (Papers presented at the Eighteenth International Conference on Patristic Studies held in Oxford 2019 ; volume 19: Eriugena's Christian Neoplatonism and its sources in patristic and ancient philosophy, 2021)