Well I mean linguistically the Scottish Celts are descended from Irish Gaelics which are descended from Gallo?-Iberian Celts which are in turn descended from Indo-European tribes, the first Steppe nomad society. Very interesting.
Well, the Scots were originally a kingdom that was split between what is now Northern Ireland and parts of the west of Scotland with a base at the fortress of Dunadd.
The Celts did in fact inhabit most of Europe in pre-Roman times, or at least very big swathes of it. For example there are some stone-made Celtic-crosses that are popular in what is today North-Western Romania (Maramures county), there are different articles about them (in Romanian) which also include some photos [1]. Now, I didn't know if that same type of cross was also present in Scotland but a quick search directed me to this article [2], which tells me that they used to be quite popular in early Christian times. The county of Maramures is pretty close to what used to be Scythia.
I've found another blog-post with more photos about the Celtic crosses from Maramures [3], and in the comments in there someone also linked to similar crosses being found in Northern Greece/Macedonia, close to Thessaloniki [4]. Very interesting stuff.
> The Celts did in fact inhabit most of Europe in pre-Roman times, or at least very big swathes of it. For example there are some stone-made Celtic-crosses that are popular in what is today North-Western Romania
Celtic crosses are a Christian thing and Christianity only got started after the Romans had subjugated large parts of Europe, so any "Celtic" crosses in Romania are guaranteed to be unrelated to a possible pre-Roman presence of Celtic tribes. (And it's not like putting a cross in a circle is a terribly original idea, so they probably came up with it independently from the Celtic Christians in Ireland.)
It’s in the Scottish-related article, lots of pre-Christian symbols and traditions got absorbed into Christianity, it was only normal, one couldn’t have imposed a “tabula rasa” in those times over an entire continent (even today is not that easy, even with all the communications and PR industries)
