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Valognes, Portbail, and Montaigu-la-Brisette are the three ancient settlements of the Cotentin peninsula of which our understanding has deepened over the last three decades, thanks to research programs combining multiple approaches (aerial, pedestrian, and geophysical surveys; oral inquiries, test pits, and excavations). Each settlement adopted a different form of urbanism, and they seem to have three complementary statuses: Valognes, the largest—and the only one to have a public entertainment building—is the probable chief town. Portbail, facing the ocean, is organized into two separate centers. And Montaigu appears to have been a small peaceful inland town. New research findings shed light on, and allow a comparison of, the pace of their development, their organization, and their facilities.