Kingdom of Scotland
…king of the Picts, Uuen, and the king of Dál Riata, Áed, were killed by Vikings. This led to a period of instability, which culminated in the rise of Cínaed mac Ailpín (Kenneth MacAlpin) as "king of the Picts" in the 840s (traditionally dated to 843), and brought to power the House of Alpin. Under the House of Alpin…