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| YEAR | DATE | EVENT | PRIME MINISTER | GOVERNOR |
| 1177 | 1 february | England occupation | ||
| 1541 | june | Union to England | ||
| 1801 | 1 january | Part ok UK | ||
| 1922 | 12 december | England Count | James Craig, Viscount Craigavon | James Albert Edward Hamilton, Duke of Abercorn |
| 1940 | 27 november | John Miller Andrews | ||
| 1943 | 1 may | Basil Stanlake Brooke, Viscount Brookeborough of Colebrooke | ||
| 1945 | 7 september | William Spencer Leveson Gower, Earl Granville | ||
| 1952 | 1 december | John de Vere Loder, Baron Wakehurst | ||
| 1963 | 26 march | Terence O'Neill | ||
| 1964 | 3 december | John Maxwell Erskine, Baron Erskine of Rerrick | ||
| 1968 | 3 december | Ralph Francis Alnwick Grey, Baron Grey of Naunton | ||
| 1969 | 3 may | James Dawson Chichester-Clark | ||
| 1971 | 23 march | Arthur Brian Faulkner (I) | ||
| 1972 | 31 march | UK direct rule | - | |
| 1973 | 18 july | - | ||
| 1974 | 1 january | UK Region | Arthur Brian Faulkner (II) | |
| 1974 | 28 may | UK direct rule | - | |
| 1998 | 1 july | State of UK | David Trimble (I) | |
| 2001 | 1 july | Sir Reg Empey | ||
| 2001 | 6 november | David Trimble (II) | ||
| 2007 | 8 may | Ian Paisley | ||
| 2008 | 5 june | Peter Robinson | ||
| 2015 | 10 september | Arlene Foster | ||
| 2021 | 17 june | Paul Givan | ||
| 2022 | 3 february | - | ||
| 2024 | 3 february | Michelle O’Neill |