The "Ammerland" was first mentioned in the 10th century. The word is believed to derive from
Ameri, which is an old word meaning "swamp". In the time of
Viking raids small ring-like castles were built in order to protect the defenceless hamlets. For many years there was little interest in this swampy region. In the 14th century it became part of the
County of Oldenburg. The counts established strongholds in the region, which was the frontier against the lands of the untamable
Frisians. The district was established in 1933 in the rough borders of the historical region. == Geography ==