production. Augmenting these discoveries, large amounts of iron slag and cinders were discovered at the marina site. Further discoveries included the remains of beam-slots and post-holes from wooden buildings; in addition to these, the remains of flint masonry walls were uncovered. Across the area of the excavations, a number of different bones from a variety of animals were unearthed; the most commonly found bones were those of cows, with over forty discovered. This supports the theory that the site was probably a significant location on a drovers' route, via which cattle were taken to London to provide meat at the markets. Drovers are likely to have rested their cows overnight at this site before continuing their journeys; thus, the current name 'Cow Roast' is believed to have been derived from a corruption of the original term, 'Cow Rest'. Cow Roast has been described by Dacorum Borough Council as, "One of the most important late Iron Age and Roman industrial landscapes in England," despite being relatively unknown and unexploited by tourism. Archaeological finds suggest that it was occupied as late as the 5th century, although the byway through the Chiltern Hills would have been an important transport conduit throughout the Roman occupation. Subsequently, it continued to be known as part of a drovers' route until the mid-19th century, with the area around the present-day Cow Roast settlement providing grazing for cattle. One mile north-west of Cow Roast, a road named 'Cow Lane' may once have comprised part of a wider network of drove routes, together with the hollow ways and common land near Ashridge, Aldbury and Pitstone. Between 1762 and 1872, a toll road called the Sparrows Herne Turnpike Road passed through Cow Roast. The New Ground Gate tollhouse was situated near New Ground Farm. Much of the present-day Cow Roast pub buildings are likely to have been built around 1800 on the site of a previous coaching inn. In 1986, the Cow Roast Inn received Grade II Listed Building status. The premises have been closed since September 2017. The section of the Grand Junction Canal which transects Cow Roast was constructed in 1799; in 1929, the waterway was renamed the Grand Union Canal. During the construction of the Grand Junction Canal and locks, a bronze Romano-British Coolus helmet was discovered; in 1813, this was acquired for display in the British Museum. Construction on the London and Birmingham Railway Line began