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Liber Floridus ("Book of Flowers") is a medieval encyclopedia that was compiled between 1090 and 1120 by Lambert, Canon of Saint-Omer. The text compiles extracts from some 192 or so different works.

Lambert's medieval encyclopedia contains a universal history, a chronological record of events to the year 1119. These are of Biblical, astronomical, geographical, philosophical and natural history subjects. Lambert wrote Liber Floridus originally in Latin, and later it was translated into French as Le Livre fleurissant en fleurs. A detailed description is in the Historia comitum Normannorum, comitum Flandriae.

The Liber Floridus was the first of the encyclopedias of the High Middle Ages that slowly superseded the work of Isidore of Seville. The original manuscript, completed in 1120 and dedicated to Saint Omer by Lambert, has been preserved in the Ghent University Library, though its latter portion has not survived. A copy is in the Bibliothèque Nationale, Paris. There is also a copy in the Herzog August Bibliothek, Wolfenbüttel, Germany. There may be as many as six additional extant manuscript copies, dating from the twelfth to the sixteenth centuries and produced in France or Flanders. Liber Floridus has the reputation of being one of the most famous encyclopedias of the Middle Ages.

Liber Floridus includes various maps including a mappa mundi. The Ghent manuscript, being the oldest of the known copies and dating from earlier than 1125, includes a map of parts of Europe and two climate-zone drawings based on the Macrobian model as an attempt to make a complete world map. The parts of the European map sketch show interesting and odd representations. This manuscript and the associated maps are believed to have been done personally by Lambert.

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