A report on the excavation of three sites on Minnow Street, Monmouth, during the 1980s and 1990s. Two of the sites contained features and finds indicative of Roman ironworking and agriculture during the 4th and 5th century and defensive features which may have been associated with a nearby earlier military building. The excavations suggested that the town expanded rapidly following the construction of the Norman castle but that this part of the town continually suffered from economic fluctuations. Each excavation is reported on individually but the finds are examined together.