The first known settlement was Samarobriva ("Somme bridge"), the central settlement of the Ambiani, one of the principal tribes of Gaul. The town was given the name Ambianum by the Romans, meaning settlement of the Ambiani people. The town has been much fought over, being attacked by barbarian tribes, and later by the Normans. In 1113 the city was recognized by King Louis VI of France, and joined to the Crown of France in 1185. In 1597, Spanish soldiers held the city during the six-month Siege of Amiens, before Henry IV regained control. During the 18th and 19th century, the textile tradition of Amiens became famous for its velours. In 1789 the provinces of France were dismantled and the territory was organised into departments. Much of Picardy became the newly created department of Somme, with Amiens as the departmental capital. During the industrial revolution the city walls were demolished, opening up space for large boulevards around the town centre. The Henriville neighbourhood in the south of the city was developed around this time. In 1848, the first railway arrived in Amiens, linking the city to Boulogne-sur-Mer. During the 1870 Battle of Amiens, when the Somme was invaded by Prussian forces, Amiens was occupied.