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| YEAR | DATE | EVENT | HEAD OF STATE |
| 1123 | Count | earl Bernard I | |
| 1158 | earl Herman I | ||
| 1160 | earl Bernard II | ||
| 1196 | earl Herman II and Bernard II | ||
| 1224 | earl Herman II | ||
| 1229 | earl Bernard III and Simon | ||
| 1265 | earl Herman III, Bernard IV and Simon | ||
| 1274 | earl Bernard IV and Simon | ||
| 1275 | earl Simon I and Simon | ||
| 1277 | earl Simon I | ||
| 1344 | earl Simon II | ||
| 1344 | earl Otto and Bernard V | ||
| 1360 | earl Simon III and Bernard V | ||
| 1365 | earl Simon III | ||
| 1410 | earl Bernard VI | ||
| 1415 | earl Simon IV | ||
| 1430 | earl Bernard VII | ||
| 1511 | earl Simon V | ||
| 1536 | earl Bernard VIII | ||
| 1563 | earl Simon VI | ||
| 1613 | Count of Lippe-Detmold | earl Simon VII | |
| 1627 | earl Simon Louis | ||
| 1636 | earl Simon Philip | ||
| 1650 | earl John Bernard | ||
| 1652 | earl Herman Adolph | ||
| 1666 | earl Simon Henry | ||
| 1697 | 22 may | earl Friedrich Adolf | |
| 1718 | 18 july | earl Simon Heinrich Adolf | |
| 1720 | 27 october | Principality | prince Simon Heinrich Adolf |
| 1734 | 12 october | prince Simon August | |
| 1782 | 1 may | prince Friedrich Wilhelm Leopold I | |
| 1802 | 4 april | prince Leopold II | |
| 1851 | 1 january | prince Leopold III | |
| 1875 | 8 december | prince Woldemar | |
| 1895 | 20 march | prince Alexander | |
| 1905 | 13 january | prince Leopold Graf zur Lippe-Biesterfeld | |
| 1905 | 25 october | prince Leopold IV | |
| 1918 | 12 november | Union to German State of Lower Saxony |