Division number 157 – in the House of Commons on 8 February 2017.
A majority of MPs agreed and voted against requiring notice of the UK's withdrawal from the EU to preserve rights acquired in Northern Ireland as a result of European Union membership and against requiring the notification to preserve the right of the people of Northern Ireland determine for themselves if they prefer a union with Great Britain or a sovereign united Ireland.
Want to understand more about this vote? Read the debate that it was part of.