At the northwestern corner of the mainland of Orkney is the tidal island (it can be reached on foot at low-tide) of The Brough Of Birsay. There are remains here from Pictish, Viking and Early Christian times.
A slab from an early Christian burial ground on the Brough of Birsay shows three warriors with swords, spears and shields below four common Pictish symbols: disc and rectangle; crescent and V-rod; "Pictish beast" (considered by various authorities to be an elephant, a porpoise or a purely imaginary beast); and eagle. This slab is believed to be a cross-slab by the way it has been shaped; one face, on which the cross may have been carved, is gone.
To the map of Orkney.