The Picts emerged as a known community in around 200AD but there is Iron Age evidence going back almost a thousand years earlier to 700BC. They were known as the painted people by the Romans and may have painted or tattooed their faces and bodies.
They were a force to be reckoned with on one of the northern borders of the Roman empire and stood their ground for at least the next 600 years.
One of the Celtic tribes, they lived in central and northern Scotland and have left behind extensive sites in Angus, Fife and Perthshire and it is believed they founded the earliest settlement that became the city of Dundee.
You can see a map of sites at this link.
Pictish stone from Aberlemno, Angus
Many towns in the region still have Pictish names such as Pittenweem and Pitlochry, “Pit” meaning cave.
Dunino Den, Fife
Kinnell Stone Circle, Killin, Perthshire
Thereafter walk as those with eyes unsealed,LEWIS GRASSIC GIBBON, By permission of The Estate of Lewis Grassic Gibbon
Knowing that we behold the Hand of Change
Made manifest; and far by utmost line
Of sky and sea and cliff and bracken range,
The vision, touched, intangible, hath passed,
Setting a sign for eyes of gods and men.