which, according to Julius Caesar, gathered the Curiosolitae, the Redones, the Osismii, the Unelli, the Caletes, the Lemovices and the Ambibarii. The last four peoples mentioned by Caesar were respectively located in Cotentin (Lower-Normandy), pays de Caux (Upper-Normandy), Limousin (Aquitany) and the location of the Ambibarii is unknown. The Caletes are sometimes also considered as Belgians and ″Lemovices″ is probably a mistake for ″Lexovii″ (Lower-Normandy). Gallo-Roman era The region became part of the Roman Republic in 51 BC. It was included in the province of Gallia Lugdunensis in 13 BC. Gallic towns and villages were redeveloped according to Roman standards, and several cities were created. These cities are Condate (Rennes), Vorgium (Carhaix), Darioritum (Vannes) and Condevincum or Condevicnum (Nantes). Together with Fanum Martis (Corseul), they were the capitals of the local civitates. They all had a grid plan and a forum, and sometimes a temple, a basilica, thermae or an aqueduct, like Carhaix. The Romans also built three major roads through the region. However, most of the population remained rural. The free peasants lived in small huts, whereas the landowners and their employees lived in proper villae rusticae. The Gallic deities continued to be worshiped, and were often assimilated to the Roman gods. Only a small number of statues depicting Roman gods were found in Brittany, and most of the time they combine Celtic elements. During the 3rd century AD, the region was attacked several times by Franks, Alamanni and pirates. At the same time, the local economy collapsed and many farming estates were abandoned. To face the invasions, many towns and cities were fortified, like Nantes, Rennes and Vannes. Immigration of Britons Toward the end of the 4th century, the Britons of what is now Wales and the South-Western peninsula of Great Britain began to emigrate to Armorica. The Romano-Britons The history behind such an establishment is unclear, but medieval Breton, Angevin and Welsh sources connect it to a figure known as Conan Meriadoc. Welsh literary sources assert that Conan came to Armorica on the orders of the Roman usurper Magnus Maximus, who sent some of his British troops to Gaul to enforce his claims and settled them in Armorica. This account was supported by the Counts of Anjou, who claimed descent from a Roman soldier expelled from Lower Brittany by Conan on Magnus's orders. The refugee Britons Regardless of the truth of this story, Brythonic (British Celtic) settlement