Remains of Elmet

'The Calder valley, west of Halifax, was the last ditch of Elmet, the last British Celtic kingdom to fall to the Angles. For centuries it was considered a more or less uninhabitable wilderness, a notorious refuge for criminals, a hide-out for refugees. Then in the early 1800s it became the cradle for the Industrial Revolution in textiles, and the upper Calder became "the hardest-worked riv...