Background
Óengus is known to have been the son of the daughter of Lulach.
Óengus is known to have been the son of the daughter of Lulach.
Óengus" last known predecessor was Máel Snechtai (d 1085). 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.
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.
Siward defeated the Moravians and Óengus was killed. The Scoti then invaded Moray, which, as Orderic Vitalis put it, "lacked a defender and lord."
After Óengus" defeat, Moray was probably granted to William fitz Duncan.