The <a href="https://en.wikipedia.org/wiki/Republic_of_Ireland" id="mwAdg" rel="mw:WikiLink" title="Republic of Ireland">Republic of Ireland</a> becomes the first nation in the world to utilise a public referendum to <a href="https://en.wikipedia.org/wiki/2015_Irish_constitutional_referendums" id="mwAdk" rel="mw:WikiLink" title="2015 Irish constitutional referendums">legalise gay marriage</a>.