| Holter Burg | |
| Built: | in the 10th and 11th centuries |
| Type: | hill castle |
| Condition: | wall remnants, ramparts |
| Location: | Bissendorf |
| Occupants: | lesser nobility |
| Coordinates: | 52.2146°N 8.1868°W |
| Map Type: | Lower Saxony#Germany |
| Code: | DE-NI |
The Holter Burg is the oldest castle site in the municipality of Bissendorf near Osnabrück in the German state of Lower Saxony. It is the ruin of a hill castle.[1] It was the third hill castle in Osnabrück Land along with the Iburg and the Wittekindsburg near Rulle.
The Holter Burg was the family seat of the lords of Holte. Their most important representatives were Wigbold of Holte, Archbishop of Cologne and Arch-Chancellor of the Empire, the Essen prince-abbess, Beatrice of Holte, and the bishops of Münster, Burchard of Holte, William I of Holte and Ludolf of Holte. The castle was probably initially destroyed as early as 1147 by the Bishop of Osnabrück, Philip of Katzenelnbogen (1141 to 1173), and the counts of Ravensberg in a feud with the lords of Holte. It may have been destroyed for the last time between 1308 and 1315, although the latest archaeological investigations suggest an earlier date, because a fire layer found in the ground dates the mid-13th century. Schloss Ledenburg in the municipality of Nemden (part of Bissendorf) was built as the "New" Holter Burg.
The Holter Burg was initially built as a tower castle on a plateau with a diameter of around 50 metres located on a rocky hill spur. It was guarded by a section of moat with a roughly 20-metre-wide and up to 10-metre-deep ditch. A roughly 2-metre-thick enceinte protected the castle. In the east the height difference between the top of the wall and the bed of the moat was around 16 metres. In the west there was no moat due to the steep hillside. The castle's first building stage, probably around 1100, consisted of the mighty round tower and the enceinte. Later, a castle chapel and palas were added.
Today only wall remains may be seen along with the plan of a round tower. The deep moats may also be made out. Within the double ditch system, the site has an area of about 5,000 square metres. In 1997 and 2006 there were archaeological excavations and safety measures in order to preserve the castle and make it attractive for visitors.