Altkönig the third highest mountain of the
Taunus range in
Hesse,
Germany, reaching 798 metres above sea level. In the
La Tène period around 400 BC, the Celts settled the Altkönig. They built
Heidetrank Oppidum, several ringwalls around the summit which are still evident. It is unknown when and why they abandoned the Altkönig.