Just over 62% supported the amendment on May 22nd 2015
'Historic', 'Love Wins', 'Equality' - some of the buzzwords that went around this weekend last year.
Ireland became the first country in the world to pass same-sex marriage by popular vote on May 22nd 2015.
But you are already sharing all your memories from that weekend on social media, with #marrefmemories trending on Twitter.
Just over 62% supported changing the Constitution, with more than 1.2 million people turning out in support of marriage equality.
While Ireland led the world press in the run up to - and following - the result.
The referendum itself, 'Home to Vote' and 'Yes Equality' were the biggest Irish news trends on Twitter last year.
And people are remembering several aspects of the campaign today:
In case you don't have goosebumps already...