> No one says it was "stolen from common people", because they have always owned it.
... but enclosure acts were specific legislative acts which privatized land and removed common access. I.e. common people had access to the land, and it was taken away. Whether it is "stolen" is perhaps messier to decide. https://en.wikipedia.org/wiki/Enclosure#Parliamentary_Inclos...
Being a monarchy is orthogonal; Norway has a king and right to roam, for example.