After invading Britain in AD 43, the Romans crossed the Humber Estuary in AD 71 to invade the Northumbrian territory of the Parisi tribe. From their bridgehead at Petuaria they travelled northwards and built roads along the Wolds to Derventio, present day Malton, and then westwards to the River Ouse where they built the fort of Eboracum. There is evidence of extensive use of the light soils of the Wolds for grain farming in the Roman era. Several Roman villas which were the centres of large agricultural estates have been identified around Langton and Rudston. In the low-lying lands on either side of the Wolds there was an increase in the number of settlements between 500 BC and AD 500, as the land became drier and more accessible due to a fall in sea level. The lower-lying land was used for stock breeding. During the last years of Roman occupation Anglo-Saxon raiders were troubling the area and, by the second half of the 5th century, settlement by Anglian invaders was taking place in east Yorkshire. Village names containing the elements -ing, -ingham or -ham are Anglian settlement names. As Christianity became established in the area from the 7th century onwards, several cemeteries like the one at Garton on the Wolds show evidence of the abandonment of pagan burial practices. In AD 867, the Great Danish Army captured the Anglian town of York, and the remnants of the army settled in Yorkshire from AD 876, when their leader Halfdan shared out the land among them. Scandinavian settlements have names including the elements -by and -thorpe. Scandinavian rule in the area came to an end in AD 954 with the death of their ruler Eric Bloodaxe.