Lochwinnoch Village group

From Wiki:

The Clochoderick stone near Howwood and Kilbarchan in Renfrewshire used to rock and it is said that the Druids used it to judge people. The accused was made to sit on the stone and by the way it moved the Druids judged the innocence or guilt of the individual. It is also said to be the burial place of Rhydderch Hael, King of Strathclyde who was the victor at the Battle of Arderydd near Arthuret in the Borders. His victory brought Christianity to Strathclyde. This stone is very unusual and is a SSSI for Geology in its own right.