At some time in the 7th century the district which is now Northamptonshire suffered a simultaneous invasion by the West Saxons from the south and the Anglian tribes from the north. Relics discovered in the county testify to a mingling of people, at the same time showing that West Saxon influence never spread farther north than a line from Daventry to Warwick, and with the extension of the Mercian kingdom under Penda and the conversion of the midland districts ceased altogether.