The Hereford Mappa Mundi is a mappa mundi

Mappa mundi

Mappa mundi is a general term used to describe medieval European maps of the world. These maps range in size and complexity from simple schematic maps an inch or less across to elaborate wall maps, the largest of which was 11 ft. in diameter...

, of a form deriving from the T and O

T and O map

A T and O map or O-T or T-O map , is a type of medieval world map, sometimes also called a Beatine map or a Beatus map because one of the earliest known representations of this sort is attributed to Beatus of Liébana, an 8th-century Spanish monk...

 pattern, dating to ca. 1300. It is currently on display in Hereford Cathedral

Hereford Cathedral

The current Hereford Cathedral, located at Hereford in England, dates from 1079. Its most famous treasure is Mappa Mundi, a mediæval map of the world dating from the 13th century. The cathedral is a Grade I listed building.-Origins:...

 in Hereford

Hereford

Hereford is a cathedral city, civil parish and county town of Herefordshire, England. It lies on the River Wye, approximately east of the border with Wales, southwest of Worcester, and northwest of Gloucester...

, England

England

England is a country that is part of the United Kingdom. It shares land borders with Scotland to the north and Wales to the west; the Irish Sea is to the north west, the Celtic Sea to the south west, with the North Sea to the east and the English Channel to the south separating it from continental...

. It is the largest medieval map known to still exist.
The map is signed by or attributed to one "Richard of Haldingham and Lafford

Sleaford

Sleaford is a town in the North Kesteven district of Lincolnshire, England. It is located thirteen miles northeast of Grantham, seventeen miles west of Boston, and nineteen miles south of Lincoln, and had a total resident population of around 14,500 in 6,167 households at the time...

", also known as Richard de Bello, "prebend of Lafford in Lincoln Cathedral". Drawn on a single sheet of vellum

Vellum

Vellum is mammal skin prepared for writing or printing on, to produce single pages, scrolls, codices or books. It is generally smooth and durable, although there are great variations depending on preparation, the quality of the skin and the type of animal used...

, it measures 158 cm by 133 cm, some 52" in diameter and is the largest medieval map known to still exist.