Top: detail of an early 16th century painted vellum map of the Trent Valley, including depictions of Newark Castle (right), bridges at Newark and Markall (left) and an early depiction of one of the fishweirs that are a distinctive feature of the valley’s archaeological record (upstream of Markall Bridge; © The British Library Board. Cotton Mss Augustus 1.i 65; Salisbury, C R 1983 ‘An early Tudor map of the River Trent in Nottinghamshire’. Transactions of the Thoroton Society of Nottinghamshire 87, 54–9). The nine icons show details from this extract and the complete map