Sueno's Stone | Myth, legend or truth?

Sueno’s Stone is around 7 feet tall. It is carved from sandstone and is thought to date back to the mid to late 800’s AD. It is a true marvel of the skill and craftwork of Pictish art.
It’s believed that this stone still stands on its original site, where it would have been a landmark visible across the marshy floodplains of the rivers Mosset and Findhorn.
The stone has two faces which show very different images, but it’s thought likely that the stories they tell, are linked.
This side of the stone is dominated by a large Christian cross. The scene directly beneath the cross, is an unusual one: there are two bearded figures facing each other. They appear to be stooping over a seated figure. This image is wholly unique in Pictish and early medieval Scottish art. It’s been interpreted as two priests who are, perhaps, conducting a royal inauguration or enthronement; the central figure is thought to be a King.
This side of the stone features what appears to be an elaborate battle scene told over a series of panels:
At the top, are a number of horsemen, possibly arriving at a battle.
The next panel shows a battle scene; these combatants are on foot.
On the next, appears to be an object that is thought to be a broch, fort, or church bell, along with a number of headless corpses
The next panel shows a group of horsemen apparently fleeing from infantry soldiers
Next is what appears to be a bridge, again with headless corpses beneath it
There is an obscured panel at the very bottom which may show the dispersal of a defeated army.
It’s not known what story the stone is telling however scholars suggest that it relates to events that took place in the mid-800s. During this time, Gaelic speaking kings took over lordship of the Picts. It was a time of great upheaval and the country was being invaded by Norsemen.
Assuming the depicted battle scene refers to a real event, it might represent one of Cinaed mac Ailpin (Kenneth MacAlpin) victories, or it could also refer to his successor, Domnall (Donald I), who consolidated Cinead’s hold on this part of Scotland. The possible inauguration scene may then be referring to the enthronement of one of these kings.
But, these scenes may not represent any real battle. They could simply be a series of Christian messages or even a legend.

It does, however, provide pictorial evidence of ancient Scottish and Pictish beheadings