The National Gazetteer of Great Britain and Ireland - 1868
"BUTTERWORTH, a township in the parish of Rochdale, hundred of Salford, in the county palatine of Lancaster, 4 miles to the E. of Rochdale. It is on the border of Yorkshire. The inhabitants are employed in the great cotton and woollen manufactories of the neighbourhood. At Milnrow, now a chapelry, is an endowed free school, founded in 1720 by Alexander Butterworth, the revenue of which is about £90 per annum. There are other charitable endowments, producing yearly above £30. In this township is Clegg Hall, an old seat of the Asshetons, built in the reign of James I. It is the scene of a traditional story given by Mr. Roby in his "Traditions of Lancashire.""