T-and-o_map

Earliest printed example of a classical T and O map (by Guntherus Ziner, Augsburg, 1472), illustrating the first page of chapter XIV of the Etymologiae. It shows the continents as domains of the sons of Noah - Sem (Shem), Iafeth (Japheth) and Cham (Ham).

The Hereford Mappa Mundi, about 1300, Hereford Cathedral, England. A classic "T-O" map with Jerusalem at center, east toward the top, Europe the bottom left and Africa on the right.

A T and O map or O-T or T-O map (orbis terrae, orb or circle of the earth), 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. The map appeared in the prologue to his twelve books of commentaries on the Apocalypse.

The T-O map represents the physical world as first described by the 7th century scholar Isidore of Seville in his Etymologiae (chapter 14, de terra et partibus):

Orbis a rotunditate circuli dictus, quia sicut rota est [...] Undique enim Oceanus circumfluens eius in circulo ambit fines. Divisus est autem trifarie: e quibus una pars Asia, altera Europa, tertia Africa nuncupatur.

"The [inhabitated] mass of solid land is called round after the roundness of a circle, because it is like a wheel [...] Because of this, the Ocean flowing around it is contained in a circular limit, and it is divided in three parts, one part being called Asia, the second Europe, and the third Africa."

Although Isidore taught in the Etymologiae that the Earth was \'round\', his meaning was ambiguous and some writers think he referred to a disc-shaped Earth. However, other writings by Isidore make it clear that he considered the Earth to be globular.Isidore, Etymologiae, XIV.ii.1[1]; Wesley M. Stevens, "The Figure of the Earth in Isidore\'s De natura rerum", Isis, 71(1980): 268-277. - Isidore also admitted the possibility of people dwelling at the antipodes, considering them as legendary (Isidore, Etymologiae, XIV.v.17[2]) and noting that there was no evidence for their existence. (Isidore, Etymologiae, IX.ii.133[3]). Indeed, the theory of a spherical earth had always been the prevailing assumption since at least Aristotle, who had divided the spherical earth into zones of climate, with a frigid clime at the poles, a deadly torrid clime near the equator, and a mild and habitable temperate clime between the two.

The T and O map is representing only the top-half of the spherical EarthMichael Livingston, Modern Medieval Map Myths: The Flat World, Ancient Sea-Kings, and Dragons, 2002.. It was presumably tacitly considered a convenient projection of the inhabited parts, the northern temperate half of the globe. Since the southern temperate clime was considered uninhabited, or unattainable, there was no need to depict them on a world map. It was then believed that no one could cross the torrid equatorial clime and reach the unknown lands on the other half of the globe. These imagined lands were called antipodes.Alfred Hiatt, "Blank Spaces on the Earth," The Yale Journal of Criticism, 15, (2002): 223–250; Michael Livingston, Modern Medieval Map Myths: The Flat World, Ancient Sea-Kings, and Dragons, 2002.

The T is the Mediterranean, dividing the three continents, Asia, Europe and Africa, and the O is the encircling Ocean. Jerusalem was generally represented in the center of the map. Asia was typically the size of the other two continents combined. Because the sun rose in the east, Paradise (the Garden of Eden) was generally depicted as being in Asia, and Asia was situated at the top portion of the map.

This qualitative and conceptual type of medieval cartography could yield extremely detailed maps in addition to simple representations. The earliest maps had only a few cities and the most important bodies of water noted. The four sacred rivers of the holy land were always present. More useful tools for the traveller were the itinerary, which listed in order the names of towns between two points, and the periplus that did the same for harbours and landmarks along a seacoast.

Later maps of this same conceptual format featured many rivers and cities of Eastern as well as Western Europe, and other features encountered during the Crusades. Decorative illustrations were also added in addition to the new geographic features. The most important cities would be represented by distinct fortifications and towers in addition to their names, and the empty spaces would be filled with mythical creatures.

Gallery

See also

• Flat Earth
• Mappa mundi

References and notes

• Crosby, Alfred W. The Measure of Reality : Quantification in Western Europe, 1250-1600. Cambridge: Cambridge University Press, 1996.

External links

• Modern Medieval Map Myths: The Flat World, Ancient Sea-Kings, and Dragons

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