What is "ackeburg"

The Ackeburg, also called the Ackenburg, in the Harz Mountains of central Germany, is the site of a high medieval hill castle, , in the borough of Falkenstein/Harz in Harz district in the state of Saxony-Anhalt. It was first mentioned in 1216 and was abandoned or destroyed in 1400. There was also a village associated with it, known as Akkeburg.