A most interesting tracery of the many kinds of people who came to be Scots, a national identity apparent to them even in the 14th century that transcended ethnicity. Surely the Declaration of Independence owes a debt to the Declaration of Abroath:
...as long as but a hundred of us remain alive, never will we on any conditions be brought under English rule. It is in truth not for glory, nor riches, nor honours that we are fighting, but for freedom – for that alone, which no honest man gives up but with life itself...
Actually, I don’t read it as a list of a variety of peoples that came to Scotland, but a chronological narrative of the migrations of the people that came to be known as Scots. They didn’t think that Scythians, Spaniards, etc, were all different groups that migrated to Scotland and got amalgamated. Rather, they traced the migration of one nation or group of tribes back through those lands, to their furthest known point of origin.