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| YEAR | DATE | EVENT | HEAD OF STATE |
| 450 | Kingdom | king Cynan Meriadoc | |
| 480 | king Gratian | ||
| 500 | king Salomon I | ||
| 510 | king Audren | ||
| 516 | king Budic I | ||
| 556 | king Chanao | ||
| 570 | king Macliaw | ||
| 570 | king Chonomor | ||
| 570 | king Tewdrig I | ||
| 570 | king Riwal I | ||
| 570 | king Riwal I | ||
| 577 | king Waroc | ||
| 594 | king Canao | ||
| 594 | king Hoel II | ||
| 600 | king Alain I | ||
| 610 | king Hoel III | ||
| 620 | king Salomon II | ||
| 632 | king Judicael | ||
| 640 | king Alain II | ||
| 680 | king Cunobertus | ||
| 700 | king Budic II | ||
| 720 | king Theodoric II | ||
| 740 | king Raulhonus | ||
| 760 | king Daniel Dremrost | ||
| 780 | king Aregstanus | ||
| 790 | king Morvan | ||
| 795 | Duchy - dinasty Brittany | duke Frodaldus | |
| 826 | duke Nominoe | ||
| 851 | duke Erispoè | ||
| 857 | king Salomon III | ||
| 874 | duke Gurvand | ||
| 877 | duke Iudicael I | ||
| 888 | king Alain I earl of Vannes | ||
| 908 | duke Gurmaleon earl Cornovaglia | ||
| 922 | king Raoul | ||
| 936 | duke Alano II | ||
| 952 | duke Drogone | ||
| 953 | earl Hoel | ||
| 958 | Counts of Rennes | duke Juhel Berengario | |
| 970 | earl Conan I | ||
| 992 | Duchy | duke Godfrey I | |
| 1008 | duke Alain III | ||
| 1040 | 1 october | duke Odo I | |
| 1056 | 1 october | duke Conan II | |
| 1066 | 11 december | duke Hoel IV | |
| 1084 | 13 april | duke Alain IV | |
| 1112 | duke Conan III | ||
| 1148 | 17 september | duke Hoel V | |
| 1156 | duke Conan IV | ||
| 1169 | dinasty Anjou-Plantagenet | duke Goffredo II | |
| 1186 | 18 august | dinasty Brittany | dukes Constance |
| 1196 | dinasty Anjou-Plantagenet | duke Arthur I | |
| 1203 | 3 april | dukes Alice | |
| 1213 | dinasty Dreux | duke Peter I | |
| 1221 | duke John I | ||
| 1286 | 8 october | duke John II | |
| 1305 | 18 november | duke Arthur II | |
| 1312 | 17 august | duke John III | |
| 1341 | 30 april | duke John IV | |
| 1345 | 26 september | duke Charles | |
| 1364 | 29 september | duke John V | |
| 1399 | 1 november | duke John VI | |
| 1442 | 28 august | duke Francis I | |
| 1450 | 19 july | duke Peter II | |
| 1457 | 22 september | duke Arthur III | |
| 1458 | 26 december | duke Francis II | |
| 1488 | 9 september | dukess Anne | |
| 1514 | 9 january | dinasty Valois-Capetingi | dukess Claudia |
| 1524 | 20 june | Duchy of Kingdom of France | |
| 1532 | Union to Kingdom of France |