via Nantes, and whose commerce boosted other aspects of the local economy, such as sweets, chocolate manufacturing, and paper for wrapping. In the 18th century, Orleans also acquired a reputation for producing vinegar, from local vineyards as well as wine traveling up the Loire. With the increase in size of ocean-going ships, large ships can now navigate the estuary only up to about Nantes. Boats on the river were traditionally flat-bottomed boats, with large but foldable masts so the sails could gather wind from above the river banks, but the masts could be lowered in order to allow the boats to pass under bridges. These vessels are known as "gabarre", "futreau", and so on, and may be viewed by tourists near pont Royal. The river's irregular flow strongly limits traffic on it, in particular at its ascent, though this can be overcome by boats being given a tow. An Inexplosible-type paddle steamer owned by the mairie was put in place in August 2007, facing Place de la Loire and containing a bar. Every two years, the Festival de Loire recalls the role played by the river in the commune's history. On the river's north bank, near the town centre, is the Canal d'Orléans, which connects to the Canal du Loing and the Canal de Briare at Buges near Montargis. The canal is no longer used along its whole length. Its route within Orléans runs parallel to the river, separated from it by a wall or muret, with a promenade along the top. Its last pound was transformed into an outdoor swimming pool in the 1960s, then filled in. It was reopened in 2007 for the "fêtes de Loire." There are plans to revive use of the canal for recreation and install a pleasure-boat port there. History Prehistory and Roman Empire See also Cenabum, Aureliana Civitas. Cenabum was a Gaul stronghold, one of the principal towns of the tribe of the Carnutes where the Druids held their annual assembly. The Carnutes were massacred and the city was destroyed by Julius Caesar in 52 BC. In the late 3rd century AD, Roman Emperor Aurelian rebuilt the city and renamed it civitas Aurelianorum ("city of Aurelian") after himself. The name later evolved into Orléans. In 442 Flavius Aetius, the Roman commander in Gaul, requested Goar, head of the Iranian tribe of Alans in the region to come to Orleans and control the rebellious