And the Picts, don’t forget the Picts.
poor picts.
carved standing stones with symbols I am not sure anyone is really sure of the meaning of, some placenames mostly in central eastern scotland (north of edinburgh), and a kings list of names (suggestive of P=gaelic names), is all we can guess at with.
Place-names with Pit- prefix (pitlochry, etc) are suggested as being pictish, with pit- related to welsh peth- (~thing) iirc. all this from decades-old memory.