| YEAR | DATE | EVENT | HEAD OF STATE | |
| 1022 | Bishopland | Bishop Siegbert | ||
| 1037 | bishop Bruno von Waldeck | |||
| 1055 | bishop Egilbert aus Bayern | |||
| 1080 | bishop Reinward | |||
| 1089 | bishop Ulrich | |||
| 1097 | bishop Ulrich | |||
| 1120 | bishop Siegward | |||
| 1140 | bishop Heinrich I | |||
| 1153 | bishop Werner aus Buckeburg | |||
| 1170 | bishop Anno von Landsberg | |||
| 1185 | bishop Dietmar | |||
| 1206 | bishop Heinrich II | |||
| 1209 | bishop Corrado Stromberg | |||
| 1236 | bishop Wilhelm I | |||
| 1242 | bishop Johann von Diepholz | |||
| 1253 | bishop Wittekind I Hoya | |||
| 1261 | bishop Kuno von Diepholz | |||
| 1266 | bishop Otto I aus Stendal | |||
| 1275 | bishop Volkwin von Schwalenberg | |||
| 1293 | bishop Konrad II von Wardenberg | |||
| 1295 | bishop Ludolf von Rostorf | |||
| 1304 | bishop Gottfried von Waldeck | |||
| 1324 | bishop Ludwig von Braunschweig-Lüneburg | |||
| 1346 | bishop Gerhard I von von Schauenburg | |||
| 1353 | bishop Dietrich III Kagelwit aus Stendal | |||
| 1361 | bishop Gerhard II von Schauenburg | |||
| 1366 | bishop Otto II von Wettin | |||
| 1369 | bishop Wittekind II von Schalksberg | |||
| 1384 | bishop Otto III von Schalksberg | |||
| 1397 | bishop Gerhard III von Hoya | |||
| 1398 | bishop Marquard von Randeck | |||
| 1398 | bishop Wilhelm II von Buchen | |||
| 1402 | bishop Otto IV von Rietberg | |||
| 1406 | bishop Wilbrand von Hallermund | |||
| 1436 | bishop Albrecht von Hoya | |||
| 1473 | bishop Heinrich III von Schauenburg | |||
| 1508 | bishop Franz I von Braunschweig-Lüneburg | |||
| 1530 | bishop Franz II von Waldeck | |||
| 1553 | bishop Julius von Braunschweig-Lüneburg | |||
| 1554 | bishop Georg von Braunschweig-Lüneburg | |||
| 1566 | bishop Hermann von Schauenburg | |||
| 1582 | bishop Heinrich Julius von Braunschweig-Lüneburg | |||
| 1587 | bishop Anton von Schauenburg | |||
| 1599 | bishop Christian von Braunschweig-Lüneburg | |||
| 1625 | vacant | |||
| 1631 | bishop Franz Wilhelm von Wartenberg | |||
| 1648 | Principality of Elector of Brandenburg | |||
| 1918 | Union to German State of Lower Saxony |