Medieval monasteries produced a large quantity of high-quality literature, but they also produced diagrams too. The Thorney Computus contains a world map, a diagram of the relationship between the four elements (earth, water, fire and air) and complex tables used to calculate the dates for Easter and other religious festivals important to the monastic community using a lunar calendar. The detail and complexity is outstanding, which is why it now resides in St John's College, Oxford University.
This document is usually attributed to the original work of Byrhtferth of Ramsey Abbey, the Ramsey Computus predating that of Thorney. Dates calculated in the work relate to the 10th and 11th centuries when Byrhtferth was alive, suggesting this was created as an exercise, or as training for practising monks.
The Peterborough Computus is almost identical and considered a sibling manuscript, it being later in date.
Peterborough Abbey was the birth place of many great documents including the Anglo Saxon Chronicle, but a less well-known document is the Mappae mundi (world map) in the Peterborough Computus, also known as the Peterborough Map or Peterborough Diagrammatic Map.
The map, dating from around 1120, attempts to explain the relation of counties, countries and cities within a large circle in a diagrammatic format that continues today in maps such as the London Underground map. Unlike modern maps, east is at the top of the map, with Jerusalem sitting at the centre of the world. Brittanaia (Britain) sits on the circle to the left of the circle; other recognisable names include Affrica, Roma and Nazareth.
The map is held at the British Library in London and has been named as a sibling map to the Thorney Map, which in turn, was thought to have been a copy of the Ramsey Map from around 1016.
Medieval monasteries produced a large quantity of high-quality literature,…
Peterborough Abbey was the birth place of many great documents including th…