 The rise of the church, and the parallel decline in fortune of the secular royal power, meant that Northumbria and its Cumbrian appendage were not strong enough militarily to fend off the next set of raiders and settlers (who first attacked the Lindisfarne monastery in 793) – the Vikings.By 875, the Northumbrian kingdom had been taken over by Danish Vikings.Cumbria was to go through a period of Irish-Scandinavian (Norse) settlement with the addition, from the late 9th century on, of the influx of more Brittonic Celts.