c.300 B.C.E. The Greek voyager Pytheas mentions Orkney
43 C.E. Orcadian chiefs submit to Claudius
80-84 Agricola leads the first Roman invasion of Scotland
139-154 The Antonine wall built and held
c.150 Ptolemy's tribal map of Scotland
208-221 Severus campaigns in Scotland
297 The Picts first named by Eumenius
306 Constantius invades Scotland
360 Ammianus Marcellinus says the Picts are divided into two peoples
c.400 Roman government of Britain ends
c.500 The Scots settle in Dalriada
554-584 King Bridei (son of Maelchon) receives Columba near Inverness
658 The Northumbrians occupy southern Pictland
683 King Bridei (son of Bili) begins to erect symbol stones?
685 Northumbrians defeated by the Picts under Bridei (son of Bili)
741 Dalriada crushed by the Picts under Oengus (son of Fergus)
842 Sueno's stone erected
843 Unification of Picts and Scots under Kenneth MacAlpin