The martyrology edited here, for the first time since the nineteenth century, derives from a rich variety of sources and has a fascinating history. While it draws on Danish and Irish manuscripts from the twelfth and thirteenth centuries, the editor argues that its layers of Metz and Cologne saints were not added either in Ireland, as has been previously thought, or in Denmark, but rather in the Benedictine monasteries at these two medieval German cities. The presence in both manuscripts of a layer of Irish saints indicates that Irish activity on the Continent had a bearing on the early...