This article charters the history and work of the Society for the Promotion of Eriugenian Studies, which celebrated its 50-year jubileum in 2020. After a brief introduction to the thought of John Scottus Eriugena, with emphasis on his primary text, Periphyseon, written between 864 and 866 and condemned as heretical in 1050, 1059, 1210 and finally in 1225, the development of SPES over the past five decades is surveyed in detail and connected to an outstanding work published in the Brill’s (...) Companions to the Christian Tradition series in Leiden, under the editorship of Adrian Guiu. The article is descriptive and analytical in its presentation of the relevant history of ideas and synthetical in its attempt to coherently integrate the most recent secondary texts on the relevant philosophical themes in Eriugena research.Contribution: The article contributes to the Society for the Promotion of Eriugenian Studies’ 50-year jubileum by summarising its conference outputs over the past five decades in an extensive overview as well as connecting its work to A Companion to John Scottus Eriugena, thereby furthering the society’s efforts and specialist research outputs to a broader, non-specialised readership. (shrink)