In the 17th century, King Louis XIV sought to establish a harbour to shelter the royal galleys from the storms of the Gulf of Lion. He also wished to create a port for the export of Languedoc’s produce. Chevalier de Clerville, the king’s engineer, identified Cap de Sète – which had been uninhabited until then – as the most suitable site for building a port. The Canal du Midi thus found its outlet into the Mediterranean.
Work began on 29 July 1666 with the construction of the Saint-Louis breakwater, a 650-metre-long stone jetty which still protects the entrance to the old port today.
Completed around 1680, the breakwater was then fitted with a simple lantern to signal the harbour entrance to ships.
The storm of October 1683 swept away the pier’s square breakwater and its lantern. All that remains is a small stone islet, still visible today, known as an ‘estron’ or ‘pilon’. A new, rounded breakwater, facing north-east, was topped by a bastion with a battery of cannons. A round lighthouse tower was immediately rebuilt, rising to a height of 14 metres. At that time, the lighthouse was lit using wood and coal. It was not until the 1690s that it switched to oil lighting.










