Founded in the Middle Ages, Rauma grew up on the Gulf of Bothnia, where a number of trade routes meet. It was granted its charter in 1442. In 1550, King Gustav Vasa decreed that citizens should be resettled in the new city of Helsinki. Despite the order, the town expanded because its inhabitants returned. It is now a major maritime port and industrial centre. The town is also renowned for its bobbin lace, a craft to which a festival is devoted in summer.