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| YEAR | DATE | EVENT | HEAD OF STATE | GOVERNOR |
| 752 | Duchy | |||
| 790 | Bishopland | |||
| 933 | Union to Marquisate of Istria | |||
| 948 | Bishopland | bishop John II | ||
| 986 | x | |||
| 991 | bishop Pietro I | |||
| 1006 | bishop Ricolfo | |||
| 1015 | bishop John III | |||
| 1017 | bishop x | |||
| 1031 | bishop Adalgaro | |||
| 1039 | x | |||
| 1050 | bishop Heribert | |||
| 1082 | x | |||
| 1106 | bishop Enrico I | |||
| 1115 | bishop Hartwig | |||
| 1135 | bishop Dietmar | |||
| 1141 | bishop Bernhard I | |||
| 1152 | bishop Bernhard II | |||
| 1186 | bishop Enrico II | |||
| 1188 | bishop Leutoldo | |||
| 1190 | bishop Wolfgang | |||
| 1200 | bishop Enrico III Ravizza | |||
| 1203 | bishop Ubaldo | |||
| 1209 | bishop Gebardo I | |||
| 1212 | bishop Corrado Bojani della Pertica | |||
| 1232 | bishop Leonardo I | |||
| 1233 | bishop Bernardo II of Cucagna | |||
| 1234 | bishop Gebardo II Arangone | |||
| 1236 | bishop John IV | |||
| 1237 | bishop Olderico de Portis | |||
| 1253 | bishop Leonardo II | |||
| 1255 | bishop Gregorio I Guerriero | |||
| 1259 | bishop Leonardo III | |||
| 1263 | bishop Arlongo de' Visgoni | |||
| 1282 | bishop Volkwin de' Portis | |||
| 1286 | bishop Brissa of Toppo | |||
| 1299 | Common | podestà Enrico Della Torre | ||
| 1368 | Venice Occupation | |||
| 1372 | Aquileia Occupation | |||
| 1381 | Common | |||
| 1382 | Free town of Austrian Empire | |||
| 1468 | 15 august | Libero Common | Antonio Bonomo | |
| 1469 | Austrian State | |||
| 1805 | 19 november | French Occupation | ||
| 1806 | 4 march | Union to Austrian Empire | ||
| 1809 | 4 may | Union to Kingdom of Italy | ||
| 1814 | 25 october | Union to Austrian Empire | ||
| 1918 | 3 november | Union to Kingdom of Italy | ||
| 1923 | Provence of Venice-Giulia | |||
| 1945 | 1 may | U.K. Occupation | Bernard Cyril Freyberg | |
| 1945 | july | Alfred Connor Bowman | ||
| 1947 | july | Kames J. Carner | ||
| 1947 | 16 september | U.N. mandate under U.K. administration | Sir Terence Sydney Airey | |
| 1951 | 31 may | Sir Thomas Winterton | ||
| 1954 | 26 october | Italian Administration | ||
| 1975 | Provence of Venice-Giulia |