The Colinton Roman Altar to the Mother Goddesses

Built into the walls of Hailes House was a Roman carving examined in the 19th Century. The stone was then moved to Fort Augustus Monastery, where it is today

A paper was produced for the Society of Antiquaries, which you can read – A Sculptured Relief of the Roman Period at Colinton

Hailes House Stone Slab record on the Government website https://www.trove.scot/image/2442410

The closest similar carving I have found is in the London Museum