"The Hereford Mappa Mundi is a medieval map of the known world (mappa mundi in Latin), of a form deriving from the T and O pattern, dating from c. 1300. It is displayed at Hereford Cathedral in Hereford, England.[1] It is the largest medieval map known still to exist.
The Hereford Mappa Mundi hung, with little regard, for many years on a wall of a choir aisle in the cathedral. During the troubled times of the Commonwealth the map had been laid beneath the floor of Bishop Audley's Chantry, where it remained secreted for some time. In 1855 it was cleaned and repaired at the British Museum. During the Second World War, for safety reasons, the mappa mundi and other valuable manuscripts from Hereford Cathedral Library were kept elsewhere and returned to the collection in 1946.[2]
In 1988, a financial crisis in the Diocese of Hereford caused the Dean and Chapter to propose selling the mappa mundi.[3] After much controversy, large donations from the National Heritage Memorial Fund, Paul Getty and members of the public kept the map in Hereford and allowed the construction of a new library to house the map and the chained libraries from the Cathedral and All Saints' Church. The new Library Building in the south east corner of the cathedral close opened in 1996." https://en.wikipedia.org/wiki/Hereford_Mappa_Mundi