<a href="https://en.wikipedia.org/wiki/Archduke_Franz_Ferdinand_of_Austria" id="mwwA" rel="mw:WikiLink" title="Archduke Franz Ferdinand of Austria">Archduke Franz Ferdinand of Austria</a> and his wife <a href="https://en.wikipedia.org/wiki/Sophie,_Duchess_of_Hohenberg" id="mwwQ" rel="mw:WikiLink" title="Sophie, Duchess of Hohenberg">Sophie</a> are <a class="mw-redirect" href="https://en.wikipedia.org/wiki/Assassination_of_Archduke_Franz_Ferdinand_of_Austria" id="mwwg" rel="mw:WikiLink" title="Assassination of Archduke Franz Ferdinand of Austria">assassinated</a> in Sarajevo; this is the <i id="mwww"><a href="https://en.wikipedia.org/wiki/Casus_belli" id="mwxA" rel="mw:WikiLink" title="Casus belli">casus belli</a></i> of <a href="https://en.wikipedia.org/wiki/World_War_I" id="mwxQ" rel="mw:WikiLink" title="World War I">World War I</a>.