Following development and consultation throughout 2021, the first wave of national milestones were laid before the Senedd in December 2021 and the second wave were laid in November 2022.
Yn dilyn eu datblygu ac ymgynghori arnynt drwy gydol 2021, cafodd y don gyntaf o gerrig milltir cenedlaethol eu gosod gerbron y Senedd ym mis Rhagfyr 2021 a’r ail don ym mis Tachwedd 2022.