Saint-Malo during the Middle Ages was a fortified island at the mouth of the Rance River, controlling not only the estuary but the open sea beyond. The promontory fort of Aleth, south of the modern centre in what is now the Saint-Servan district, commanded approaches to the Rance even before the Romans, but modern Saint-Malo traces its origins to a monastic settlement founded by Saint Aaron and Saint Brendan early in the 6th century. Its name is derived from a man said to have been a follower of Brendan, Saint Malo or Maclou.

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