sentences:  In 1115 a community of Augustinian canons was founded in the burh of Runcorn by William fitz Nigel, the second Baron of Halton and Constable of Chester, on the south bank of the River Mersey where it narrows to form the Runcorn Gap.This was the only practical site where the Mersey could be crossed between Warrington and Birkenhead, and the archaeologists Fraser Brown and Christine Howard-Davis consider it likely that the canons cared for travellers and pilgrims crossing the river.They also speculate that William may have sought to profit from the tolls paid by these travellers.