Description : In Armorica , Aleth or city of Aleth 1 (also written Alet , and Aled in Breton) was for a time the capital of the Celtic people of the Coriosolites (apart from the period when the capital was Corseul ), then became a Gallo-Roman stronghold, a city in the Middle Ages and finally a fortress in the following centuries. The Coriosolites , one of the Celtic tribes of Armorica , occupied the site of Aleth as early as 80 BC The sea level at that time was 8 meters below the current level. It is an important site, combining port activities and metallurgical production 2 . Gallo-Roman period At the beginning of our era, the city was occupied by the Romans, who set it on fire around the year 10 , during the reign of Tiberius , perhaps in connection with local revolts, and it was then abandoned in favor of Corseul . Alet disappeared to become Reginca (name which also designates the Rance ). Stone constructions are emerging. Around 270 or 280, in a general context of insecurity, the authorities fortified the promontory of Alet. A rampart 3 to 4 m high was built following the outline of the cliffs, over a length of 1,400 m (we can still see some portions of it today). The rampart is fitted with square towers. Of the Roman fortifications, only a section of the wall remains today facing the intramural city of Saint-Malo and some of the foundations of the Solidor 2 tower enclosure . In the iv th century , around 340 , it is likely qu'Aleth become the new capital of the civitas Coriosolites. The site is more easily defended by its natural configuration than Corseul . Around 380, Aleth welcomed the principia 2 , or headquarters, of the garrison of Martenses soldiers responsible for the surveillance of a portion of the coastline within the framework of the Tractus Armoricanus and Nervicanus .
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