This report has specialist contributions on aspects of the Peel Castle site which either present new evidence for the Isle of Man or explore a new approach to the data. Sections are included on the prehistoric environmental evidence, a re-examination of the flint work of the Isle of Man, a discussion of the Viking Age artefacts, an assessment of the Early Christian cross slabs, a description of the Norse coins, the application of new analytical techniques to the study of Norse beads, pioneering studies of constructional materials in relation to trade and architecture, the analysis of the largest assemblage of pottery from any site in the Isle of Man, and the similarly important groups of fish bones, bird bones, animal bones and human bones, and the Carbon 14 data for an important series of structures, ranging from Iron Age huts to Norse ramparts.