Ermine Street is a major Roman road in England that ran from London (Londinium) to Lincoln and York (Eboracum). The Old English name was Earninga Strǣt (1012), named after a tribe called the Earningas, who inhabited a district later known as Armingford Hundred, around Arrington, Cambridgeshire, and Royston, Hertfordshire. "Armingford", and "Arrington" share the same Old English origin. The original Celtic and Roman names for the route remain unknown. It is also known as the Old North Road from London to where it joins the A1 Great North Road near Godmanchester.

Godmanchester is a town and civil parish in the Huntingdonshire district of Cambridgeshire, England. It is separated from Huntingdon, 1 mile (1.6 km) to the north, by the valley of the River Great Ouse. Being on the Roman road network, the town has a long history. It has a waterside location, surrounded by open countryside of high value for its biodiversity but it remains highly accessible, with a railway line to London, the A1 road and M11/A14 which run nearby.