Ордерик Виталий
Orderic Vitalis wrote that in the year 1130, Óengus with Máel Coluim mac Alaxandair invaded Gaelic Scotia with 5000 warriors. The Moravians were met by King David's general, an old Anglo-Saxon noble named Edward Siwardsson, causing the Battle of Stracathro. The "Anglo-Saxon Chronicle" reported "a great slaughter" . The "Annals of Ulster" tells that 4000 Moravians were killed, and only 1000 Gaels. The "Annals of Innisfallen" makes clear that what Orderic Vitalis wrote regarding the battle having taken place in Scotia indicates that it was an invasion. Edward defeated the Moravians and Óengus was killed. The Scoti then invaded Moray, which, as Orderic Vitalis put it, "lacked a defender and lord."