 Although Cumbria was previously believed to have formed the core of the Early Middle Ages Brittonic kingdom of Rheged, more recent discoveries near Galloway appear to contradict this.For the rest of the first millennium, Cumbria was contested by several entities who warred over the area, including the Brythonic Celtic Kingdom of Strathclyde and the Anglian kingdom of Northumbria.Most of modern-day Cumbria was a principality in the Kingdom of Scotland at the time of the Norman conquest of England in 1066 and thus was excluded from the Domesday Book survey of 1086.