Division number 86 – in the House of Commons on 20 Rhagfyr 2017.
A majority of MPs wedi pleidleisio against holding a referendum to choose between either accepting the terms of an agreement for the UK's withdrawal from the EU or remaining a member of the EU.
Eisiau deall mwy am y bleidlais hon? Darllenwch y ddadl yr oedd yn rhan ohoni.