The Liesgau is an early medieval county (Gau) of the Duchy of Saxony

Duchy of Saxony

The medieval Duchy of Saxony was a late Early Middle Ages "Carolingian stem duchy" covering the greater part of Northern Germany. It covered the area of the modern German states of Bremen, Hamburg, Lower Saxony, North Rhine-Westphalia, and Saxony-Anhalt and most of Schleswig-Holstein...

, located in modern-day Germany

Germany

Germany , officially the Federal Republic of Germany , is a federal parliamentary republic in Europe. The country consists of 16 states while the capital and largest city is Berlin. Germany covers an area of 357,021 km2 and has a largely temperate seasonal climate...

. It lies on the south-west side of the Harz Mountains

Harz

The Harz is the highest mountain range in northern Germany and its rugged terrain extends across parts of Lower Saxony, Saxony-Anhalt and Thuringia. The name Harz derives from the Middle High German word Hardt or Hart , latinized as Hercynia. The legendary Brocken is the highest summit in the Harz...

 in present-day Lower Saxony

Lower Saxony

Lower Saxony is a German state situated in north-western Germany and is second in area and fourth in population among the sixteen states of Germany...

. Its southern bound is near the town of Duderstadt

Duderstadt

Duderstadt is a city in southern Lower Saxony, Germany, located in the district of Göttingen. It is the center and capital of the northern part of the Eichsfeld...

 and its northern bound is near Osterode

Osterode am Harz

For the town in East Prussia formerly called Osterode, see Ostróda.Osterode am Harz often simply called Osterode, is a town in south-eastern Niedersachsen on the south-western edge of the Harz mountains. It is the seat of government of the district of Osterode. The town is twinned with Scarborough,...

, while its western bound is near the River Leine

Leine

The Leine is a river in Thuringia and Lower Saxony, Germany. It is a left tributary of the Aller river and 281 km in length.The river's source is located close to the town of Leinefelde in Thuringia...

 and its eastern bound corresponds to the present-day eastern border of Lower Saxony. It roughly conforms to the boundaries of the Osterode

Osterode (district)

Osterode is a district in Lower Saxony, Germany. It is bounded by the districts of Göttingen, Northeim and Goslar, and by the state of Thuringia .-History:...

 district.

The Liesgau is mentioned under the name Hlisgo in several documents from the 9th to 11th centuries. It was bordered by the following counties (list may be incomplete): Salzgau, Harzgau

Harzgau

The Harzgau was a medieval 'gau' county near the northeastern Harz mountains in the Eastphalia region of the Duchy of Saxony. It included the towns of Halberstadt, Quedlinburg, and Osterwieck, and was bounded by the Oker in the west, by the Großer Graben in the north, the Bode in the east, and the...

, Helmengau, Eichsfeld

Eichsfeld

The Eichsfeld is a historical region in the southeast of Lower Saxony and northwest of Thuringia in the south of the Harz mountains...

, Lochne, Suilberge. Its most important town was Pöhlde

Pöhlde

Pöhlde is a village in southern Lower Saxony in Germany. It is part of the town Herzberg am Harz. It has a population of 2207 . Archaeological excavation has revealed traces of settlement dating to the 2nd through 4th centuries AD. The town is noted for its Benedictine abbey...

. In the 13th century, the Liesgau became part of the Duchy of Brunswick-Lüneburg, and later closely corresponded to the Grubenhagen subdivision of this duchy.