King Arthur’s Round Table

I don’t know when it was, or who it was, but at some point in time some idiot decided to build a road through the edge of this monument.
There were originally two entrances, only the one to the South East remains leading in through the banks, across a raised walkway over the ditch into the central enclosure.
This can only be some kind of gathering place- we can only wonder what went on here. Interestingly the entrance to Mayburgh Henge can easily bee seen from the centre of circle – how and why were these two monuments linked?