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In page History of the Isle of Man:

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Even if the supposed conquest of the Menavian islands – Mann and Anglesey – by Edwin of Northumbria, in 616, did take place, it could not have led to any permanent results, for when the English were driven from the coasts of Cumberland and Lancashire soon afterwards, they could not well have retained their hold on the island to the west of these coasts.[citation needed] One can speculate, however, that when Ecgfrið's Northumbrians laid Ireland waste from Dublin to Drogheda in 684, they temporarily occupied Mann.[4]