Poll: Should gay marriage be legalised in Northern Ireland
Cast you vote in our online poll on same-sex marriage
Northern Ireland's Assembly members vote on a proposal to legalise same-sex marriage in the region - the fifth time a bid to change Northern Ireland's marriage laws has come before the devolved legislature at Stormont, Belfast.
MLAs have rejected the introduction of gay marriage on the four previous occasions.
Following the signing into law of same-sex marriage legislation in the Republic of Ireland last week, Northern Ireland is now the only part of the UK or Ireland where civil marriage is denied to same-sex couples.
Previous votes at Stormont have proved controversial, as unionists opposed to legalisation have used a contentious Assembly mechanism to effectively veto it.
A petition of concern has again been deployed by the Democratic Unionists ahead of today's vote - meaning the proposal is set to be rejected even if a majority of MLAs back it.