Argengau

Argengau was a territory of Alemannia within

East Francia East Francia (Medieval Latin: ) or the Kingdom of the East Franks () was a successor state of Charlemagne's Carolingian Empire, empire ruled by the Carolingian dynasty until 911. It was created through the Treaty of Verdun (843) which divided t ...

in the 8th and 9th centuries, being a county in the 9th century,Smith, Julia M.H. "Einhard: The Sinner and the Saints" ''Transactions of the Royal Historical Society'', Vol. 13 (2003) 55-77 cites Count Conrad of Argenau, 59. and of the

Duchy of Swabia The Duchy of Swabia (German: ''Herzogtum Schwaben'') was one of the five stem duchies of the medieval German Kingdom. It arose in the 10th century in the southwestern area that had been settled by Alemanni tribes in Late Antiquity. While the ...

in the 10th. It was situated north of

Lake Constance Lake Constance (german: Bodensee, ) refers to three Body of water, bodies of water on the Rhine at the northern foot of the Alps: Upper Lake Constance (''Obersee''), Lower Lake Constance (''Untersee''), and a connecting stretch of the Rhine, ca ...

, comprising

Lindau Lindau (german: Lindau (Bodensee), ''Lindau am Bodensee''; ; Low Alemannic German, Low Alemannic: ''Lindou'') is a major Town#Germany, town and Lindau (island), island on the eastern side of Lake Constance (''Bodensee'' in German) in Bavaria, Ge ...

. It was named for the

Argen river The Argen is a river in Baden-Württemberg, Germany. It flows into Lake Constance between Kressbronn am Bodensee and Langenargen as the third largest tributary to the lake. It is long; if one includes the Obere Argen and its source river Seele ...

Notes Geography of Baden-Württemberg {{Germany-geo-stub