Rezé dates back to the Roman era, when it was known as Portus Ratiatus (port of Rezé) and Ratiatum Pictonum Portus (Picton port of Rezé). Being populated by the Ambilatres tribe, whose location on the south bank of the lower Loire is not established with certainty, between Armorica and CelticaGaul.
Rezé was an important port on the south shore of the Loire, established opposite the port of Namnetes, located north of the Loire, Nantes - Contigwic of its Gaulish name - and it is experiencing rapid development, which suggests a strong power of attraction, a place for meetings and trade between the various Celtic tribes of the region (Veneti, Namnetes, Ambilatres, Andecavis and of course Pictones).
In 510 a Latin Catholic Diocese of Rezé was established on territory split off from the Diocese of Poitiers. It was suppressed 851, its territory being reassigned to the nearby then Diocese of Nantes. No incumbents or other details available.
It has ruins of Gallo-Roman settlement and a priory of Saint Lucien.
In feudal times, it was the capital of Pays de Retz which means “Land of Rezé” within the Duchy of Brittany, after the invasion of the Bretons.
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