On Monday at 9pm, RTÉ Two will screen the first part of Invisible Thread’s documentary about last years marriage referendum. Watch the heartwarming trailer now.

One sunny day in late May 2015, Ireland went to the polls to vote on same sex marriage – the first country in the world to do so by public vote. The world was watching our small nation as the future of equality for Ireland’s lesbian, gay, bisexual and transgender people was up for debate and ultimately a national decision.

Judging from this trailer for The Story of Yes, it’s going to be pretty emotional viewing.