<a href="https://en.wikipedia.org/wiki/Elizabeth_II" id="mwAY8" rel="mw:WikiLink" title="Elizabeth II">Elizabeth II</a> becomes the <a href="https://en.wikipedia.org/wiki/List_of_monarchs_in_Britain_by_length_of_reign" id="mwAZA" rel="mw:WikiLink" title="List of monarchs in Britain by length of reign">longest reigning monarch of the United Kingdom</a>.