The name "Fehmarn" derives from the word "Fembre" which used to mean "situated in the sea". The island was first under Danish command, later it belonged to Prussia, before it became part of the German Reich in 1871. The castle ruin of Glambeck in Burgtiefe, built in 1210, is a witness of the past. The flag of Fehmarn with the golden crown on a blue background was introduced in 1580 and is still used today. Since 1963 Fehmarn is reached from the South via the Fehmarnsund Bridge.