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History > Anglo-Saxon England > The achievement of political unity > The reconquest of the Danelaw

When Alfred died in 899, his son Edward succeeded him. A large-scale incursion by the Danes of Northumbria ended in their crushing defeat at Tettenhall in 910. Edward completed his father's plan of building a ring of fortresses around Wessex, and his sister Aethelflaed took similar measures in Mercia. In 912 Edward was ready to begin the series of campaigns by which he relentlessly advanced into the Danelaw (Danish territory in England), securing each advance by a fortress, until he won back Essex, East Anglia, and the east-Midland Danish areas. Aethelflaed moved similarly against the Danish territory of the Five Boroughs (Derby, Leicester, Nottingham, Lincoln, and Stamford). She obtained Derby and Leicester and gained a promise of submission from the Northumbrian Danes before she died in 918. Edward had by then reached Stamford, but he broke off his advance to secure his acceptance by the Mercians at Tamworth and to prevent their setting up an independent kingdom. Then he took Nottingham, and all the Danes in Mercia submitted to him.

Meanwhile another danger had arisen: Norsemen from Ireland had been settling for some time west of the Pennines, and Northumbria was threatened by Raegnald, a Norse leader from Dublin, who made himself king at York in 919. Edward built fortresses at Thelwall and Manchester, and in 920 he received Raegnald's submission, along with that of the Scots, the Strathclyde Welsh, and all the Northumbrians. Yet Norse kings reigned at York intermittently until 954.

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