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Origin and history

Rohan Bridge is an iconic art work located in Landerneau, spanning Elorn in Finistère. Built in the early 16th century by John II of Rohan, Viscount of Leo, it replaces an old wooden bridge attested in 1336. This stone bridge, designed to withstand tides, separates fresh and brackish waters from the aber, which then served as an active port for trade to Spain, Flanders and the Baltic. It originally included utility equipment: two shops, a mill, a prison, a fishery, a chapel and a guard room, reflecting its central role in the economic and social life of the city.

In the 17th century, the bridge changed with the addition of bourgeois houses, including that of Jacques Gillart, local magistrate, built in 1639 in a Renaissance style with stilts anchored in the river bed. These houses, supporting their structure on the deck of the bridge, illustrate the architectural ingenuity of the time. The toll introduced by Jean de Rohan to finance maintenance was abolished in 1760, causing a gradual deterioration of the structure. In 1825, a fire destroyed the mill, a symbol of industrial activities related to the Elorn River, before its definitive demolition in 1897.

The Rohan bridge crosses the centuries by adapting to modern needs: during the occupation, the Wehrmacht added a wooden bridge, replaced in 1958 by a concrete structure to relieve traffic congestion. Ranked Historic Monument in stages (1929 for the house of the seventeenth century, 2010 for the entire bridge, and 2022 for its totality including the facades of the buildings), it remains one of the few inhabited bridges of Europe still in use. Its history reflects the urban evolution of Landerneau, a former coastal city and major port, now preserved as an exceptional heritage.

The structure consists of five uneven arches, two of which connect intermediate islets bounded by dikes and dams. The first arch, visible on Leon's dock, crossed a spillway, while the three downstream arches crossed the main arm of the Elorn. These hydraulic features, combined with its role as a road hub since Antiquity (roads linking Vorgium to Gesocribate), underline its strategic importance. Local materials, such as Logonna's stone, and medieval and renaissance construction techniques coexist in this unique building.

The protection of the bridge extends over nearly a century: the house of the seventeenth century (12 rue du Pont) was classified in 1929 for its architecture representative of the reign of Louis XIV, followed in 1932 by a partial inscription. In 2010, the entire bridge and its houses were registered, before an overall ranking in 2022, covering the facades, roofs and floors of the supported plots. These measures preserve a rare testimony of medieval and modern urban planning, where housing, commerce and infrastructure blend harmoniously.

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