Cafodd y ddogfen Diwygio ein Hundeb ei chyhoeddi gyntaf ym mis Hydref 2019, wrth i’r DU baratoi i ymadael â’r Undeb Ewropeaidd. Cafodd ei diweddaru i adlewyrchu’r newid yn yr amgylchiadau cyfansoddiadol a gwleidyddol sy’n effeithio ar Gymru a gweddill y DU.
Reforming Our Union was first published in October 2019, as the UK was preparing to leave the European Union. It has been updated to reflect the changed constitutional and political circumstances which affect Wales and the rest of the UK.