2023 marks the 800th anniversary of the death of Gerald of Wales. Scholarship to-date has focused on Gerald's extensive non-legal literature. His contribution to canon law has hitherto been neglected. However, Gerald was a canon lawyer of considerable stature. He was a student and teacher of canon law, he administered canon law and defended it against the encroachment of the royal law, and he litigated in canon law to the highest level – the papal court in Rome.