Gadiacum was a significant Roman town located in the region of Gallia Narbonensis, which is in modern-day southern France. It is believed to have been an important center for trade and administration during the Roman Empire, though specific details about its history and significance are limited. The site may be associated with the modern town of Gignac, but further archaeological evidence is needed to establish a more comprehensive understanding of Gadiacum's role in ancient Roman society.