Division number 183 – in the House of Commons on 13 Mehefin 2018.
A majority of MPs disagreed and wedi pleidleisio not to make incompatibility with the general principles of EU law actionable in the UK courts following the UK's withdrawal from the union.
Eisiau deall mwy am y bleidlais hon? Darllenwch y ddadl yr oedd yn rhan ohoni.