| YEAR | DATE | EVENT | HEAD OF STATE |
| 1127 | 15 october | Bishopland | Bishop Bernhard I von Ösede |
| 1160 | bishop Ebergisl | ||
| 1178 | bishop Siegfried | ||
| 1186 | bishop Bernhard II von Ösede | ||
| 1203 | bishop Bernhard III | ||
| 1224 | bishop Thomas Oliver | ||
| 1225 | bishop Wilbrand von Wildeshausen bishop of Utrecht | ||
| 1227 | bishop Bernhard IV von Lippe | ||
| 1247 | bishop Simon I von Lippe | ||
| 1277 | bishop Otto von Rietberg | ||
| 1307 | bishop Günther von Schwalenberg | ||
| 1310 | bishop Dietrich II von Itter | ||
| 1321 | bishop Bernhard V von Lippe | ||
| 1341 | bishop Balduin von Steinfurt | ||
| 1361 | bishop Heinrich III Spiegel von Desenberg | ||
| 1380 | bishop Simon II von Sternberg | ||
| 1390 | bishop Ruprecht of Jülich-Berg | ||
| 1394 | bishop John Hoya | ||
| 1399 | bishop Bertram Arvassani | ||
| 1401 | bishop Wilhelm of Jülich-Berg | ||
| 1415 | bishop Dietrich III von Mörs | ||
| 1463 | bishop Simon III von Lippe p.e. Koln | ||
| 1498 | bishop Hermann von Hesse | ||
| 1508 | bishop Erich of Brunswick-Lüneburg | ||
| 1532 | bishop Hermann II von Wied | ||
| 1547 | bishop Rembert von Kertzenbroich | ||
| 1568 | bishop Johann II von Hoya | ||
| 1574 | bishop Valentin von Isenburg p.e. Koln | ||
| 1577 | bishop Heinrich IV von Saxe-Lauenburg | ||
| 1585 | bishop Theodor von Fürstenberg | ||
| 1618 | bishop Ferdinand I of Wittelsbach p.e. of Koln | ||
| 1650 | bishop Theodore Adolf von der Recke | ||
| 1661 | bishop Ferdinand II von Fürstenberg | ||
| 1683 | 15 september | bishop Hermann Werner Wolf von Metternich zu Gracht | |
| 1704 | 21 may | bishop Franz Arnold Wolf Freiherr von Metternich zu Gracht | |
| 1719 | 21 march | bishop Clemens August Herzog von Bayern p.e. of Koln | |
| 1763 | 25 january | bishop Wilhelm Anton Graf von der Asseburg | |
| 1782 | 26 december | bishop Friedrich Wilhelm Freiherr von Westphalen | |
| 1789 | 6 january | bishop Franz Egon von Fürstenberg | |
| 1802 | 3 august | Union to Markgraft of Brandenburg | |
| 1918 | 9 november | Union to German State of Westfalia |