were constructed on the quays and a third assisted mariners in locating the harbour's sea entrance. The third, situated on the Île du Lion de Mer, would have been the primary beacon that ships would have navigated toward. As ships approached the harbour, the Triton lighthouse on the northern side of the channel into the harbour and the other lighthouse on the southern side would have marked the entrance and thus provided safe passage into the harbour.

Post-Roman history

Between the 7th and the 9th centuries, Muslim invaders

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