changes to the long seashore which resulted from the silting up of the series of graus or openings which were interspersed between the islands which made up the shoreline (St. Martin; St. Lucie) had a more serious impact than the change in course of the river. Other causes of decline were the plague and the raid of Edward, the Black Prince, which caused much devastation. The growth of other ports was also a factor.
Narbonne Cathedral
Narbonne Cathedral, dedicated to Saints Justus and Pastor, provides stark evidence of Narbonne's sudden and dramatic change of fortunes when one sees at the rear of the structure the enormously ambitious building programme frozen in time, for the cathedral—still one of the tallest in France—was never finished. The reasons are many, but the most important is that the completed cathedral would have required demolishing the city wall. The 14th century also brought the plague and a host of reasons for retaining the 5th-century (pre-Visigothic) walls.
Yet the choir, side chapels, sacristry, and courtyard remain intact, and the cathedral, although no longer the seat of a bishop or archbishop, remains the primary place of worship for the Roman Catholic population of the city, and is a major tourist attraction.
Building of the Canal de la Robine
From the sixteenth century, eager to maintain a link to important trade, the people of Narbonne began costly work to the vestiges of the Aude River's access to the sea so that it would remain navigable to a limited draft vessel and also serve as a link with the Royal Canal. This major undertaking resulted in the construction of the Canal de la Robine, which was finally linked with the Canal du Midi (then known as the Royal Canal) via the Canal de Jonction in 1776. In the 19th century, the canal system in the south of France came into competition with an expanding rail network, but kept some importance due to the flourishing wine trade.
Hence,
