- 1914 28 Jun Archduke Franz Ferdinand of Austria-Hungary is assassinated in Sarajevo by Gavrilo Princip, a Serb.
- 1919 28 Jun The Treaty of Versailles, which allocates sole guilt for World War One to Germany, is signed near Paris.
- 1922 28 Jun The Irish Civil War starts when Free Irish State forces bombard anti-treaty republicans in Dublin.

