 versions of the 'Commentary' are known from as early as the eleventh century, but the work was not printed until 1472 (by Nicolaus Jenson in Venice), without the map. The map was included in the edition of 1483 (Bonino de Bonini, Brescia).

Maps that resemble this type, the 'Macrobian' or 'zonal', appear in copies of the 'Commentary' through the Middle Ages, and especially proliferate in manuscripts made in the twelfth century. The present map hybridizes the medieval 'Macrobian' type, which illustrates his climactic theories, with new discoveries in how the continents are shaped. The medieval model is preserved in that the map places the known or habitable world in-between two inhabitable zones located at the poles (labeled 'Frigida'). A large 'Temperata Antipodum nobis incognita' in the south, separated from the central 'Alveus Oceani' by the extremely hot 'Perusta' zone. 

Macrobius’s climatic theory differs slightly from classical models offered by authors like Cicero and 

. Whereas Cicero thought the southern zone was habitable and Isidore noted that 'the Antipodes are fabulously said to dwell', Macrobius considered that the heat of the torrid zone made passage to the Antipodes impossible.

Two parts in one volume. 122 leaves. Small folio. Roman type with some Greek text, headline and forty-five lines; woodcut map; woodcut diagrams; one intaglio woodcut initial; three to nine-line initial spaces.

This world map illustrates Macrobius's (fl. 400 AD) climactic theories within his 'Commentary on The Dream of Scipio'. Maps resembling this one can be found in medieval copies of Macrobius's work, but here the geography is fused with contemporary cartographical trends, in that the shapes of the continents in the upper half resemble those modeled after Ptolemy. The world is oriented north and surrounded by oceans; the known (and labeled) landmasses in the northern hemisphere are balanced by a symmetrical ‘terra incognita’ (unknown land) in the south. Tiny windheads surround the earth, with floral decorations in each corner.

The 'Commentary on the Dream of Scipio', originally composed around 400 CE, recounts Macrobius’s dream in which Scipio Aemilianus is visited by the spirit of his grandfather, Scipio Africanus, the conqueror of Carthage. The older Scipio takes the younger up to the heavens and grants him a new perspective of the earth.

Macrobius’s 'Commentary' influenced European thought for many generations. It was informed by Neoplatonic perspectives on the theories of dreams, the mystic properties of numbers, the nature of the soul, and the relationship between astronomy and music. Macrobius’s speculations on the insignificant size of the earth in relation to the cosmos and the ephemerality of life were especially significant to European explorers like Columbus of the fifteenth and sixteenth centuries.

Hybrid T-O map

Textual page with small geometric diagram 

Zodiac diagram

Circular diagram

Textual page 

This version of Ambrosius Macrobius’s 'Commentary on the Dream of Scipio' includes a hybrid world map, which combines medieval climatic theory with Ptolemaic projections.

Contemporary blind-decorated calf-backed oak boards, remains of clasps and catches.