Rwyf wedi cyflwyno fy achos ar ffurf copi caled i'r Goruchaf Lys heddiw, ac amgaeaf gopi o'r achos hwnnw. Yn gyffredinol ac o safbwynt Cymru, rwyf wedi ceisio cyflwyno dadl sy’n datgan bod rhaid i’r broses o adael yr UE gael ei chynnal mewn ffordd sy’n gyson â’r trefniadau cyfreithiol a chyfansoddiadol priodol, ac mai dyma’r unig ffordd y gellir ei chynnal. Yn fy achos, rwyf yn datgan na ellir defnyddio’r pŵer uchelfreiniol i gyflwyno hysbysiad o dan Erthygl 50.
I have today filed my printed case with the Supreme Court and am including a copy of that case.  In outline and from a Welsh perspective, I have sought to argue that the process of withdrawing from the EU must, and may only, be carried out consistently with the appropriate legal and constitutional arrangements. In my case, I submit that the prerogative power cannot be used to give notification under Article 50.