The Roman town of Moridunum, on the site of modern-day Carmarthen, lay at the very edges of Roman Wales and little is known about it. This report presents the evidence from a series of excavations around the town, including Spilman Street, Priory Street, Church Street and the Parade, in order to answer questions about the Roman presence in the town, particularly the puzzle of why no evidence of a vicus has been discovered despite the existence of a fort. The report, which focuses on each site in turn, also includes a discussion of the establishment of Moridunum and its trading links with other centres, an analysis of the phases of the fort and illustrated specialist reports on the finds and environmental remains.