Blackburnshire was a hundred, or ancient division of the county of Lancashire, in northern England. It was centred on Blackburn, and was divided into the four forests of Accrington, Pendle, Trawden and Rossendale. The shire probably originated as a county of the Kingdom of Northumbria, but was much fought over, and by the time of the Domesday Book it and other hundreds in between the Ribble and Mersey rivers (called "Inter Ripam et Mersam" in the Domesday Book) were included with the information… (More on Blackburnshire)