Agas' map is the earliest printed map - or rather map view - of London. Guildhall Library holds one of only three known impressions. It is printed from eight woodblocks and measures approximately two metres in length. The map is based on a slightly earlier, larger map printed from copper plates in the 1550s, but only three of the copper plates and no paper copies of this prototype have survived. The date of the first printing of the 'Agas' map can be fixed between 1561 and 1571 from topographical evidence. The map is almost certainly not by Ralph Agas, but his name has been associated with the map for centuries. The east - west scale is about 28 inches to a mile. Note how the map changes to a panoramic view towards the north. The immense value of this map is the three-dimensional detail, which though crude and simplified reveals many facets of life in Tudor London, such as the archers and laundresses in Finsbury Fields, the moat around London's wall, and the water conduits in Cheapside.