sentences:  Until about 1600, Stømsø was an island surrounded by the Drammenselva, but was later made landfast.In 1728 Strømsø was granted rights as a trade center by the king, and these rights were expanded to full trade rights in 1745.In 1811 Strømsø and Bragernes (on the northern side of Drammenselva) were united to form the town of Drammen.