Warburg is a town in eastern North Rhine-Westphalia on the river Diemel near the three-state point shared by Hessen, Lower Saxony and North Rhine-Westphalia. It is in Höxter district and Detmold region. Warburg is the midpoint in the Warburger Börde.

The main town, consisting of the Old Town (Altstadt) and the New Town (Neustadt) and bearing the same name as the whole town, is a hill town. While the Old Town lies in the Diemel Valley, the New Town rises on the heights above the Diemel. The Warburg municipal area borders in the west on the Sauerland and in the northwest on the Eggegebirge foothills, while in the north and northeast the Warburger Börde abuts the town and in the south stretches the Diemel Valley.

Warburg consists of the following 16 centres:

In the 4th millennium BC, there was a megalith culture in the Warburg area.

In the 1st century AD, there were Germanic settlers south of the Desenberg.

In the 8th century, there was a Saxon noble seat west of the town. In the 8th and 9th centuries came the Christianization of the Saxons in the Diemel area.

The name Warburg was first mentioned in a document sometime around 1010, although archaeological finds have established that there were already people living in what is now Warburg by protohistoric times. The first definite documentary mention came in 1036.

In the 11th century there was on the Warburger Burgberg ("Castle Mountain") the "Wartburg", under whose protection people came and settled. The castle was at first owned by Count Dodiko, whose estate, according to documents, passed in 1020 to the Bishop of Paderborn when the Count's only son met his end in an accident. Eventually, sometime between 1021 and 1033, the Emperor further granted to the bishop the Count's rights. About 1180, the Old Town was granted town rights.

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