The most widely read book of this nature was the _De imagine mundi_, which dates from about 1100. Though this has often been attributed in recent years to Honorius of Autun (it has also been ascribed to St. Anselm and with far greater probability to an unknown Honorius Inclusus), the evidence at hand is insufficient to warrant us in coming to any definite conclusions on the vexed question of its authorship.[442] The general character of the compilation is illustrated by a remark at the close of the dedicatory letter: “I place nothing in this work except that which is approved by the best authorities.”[443] The main source of the geographical chapters was the _Etymologiae_ of Isidore, though the author also drew directly from Orosius.[444] It seems likely, indeed, that the geographical chapter of Orosius served as a basis for the entire compilation and provided an outline which was embellished by copious excerpts of detail from the more elaborate writings of Isidore, Augustine, and Bede. Furthermore, it is even probable that the unknown author had a map before him.[445] He appears to have borrowed directly from the _Collectanea rerum memorabilium_ of Solinus his account of the marvels of India, though elsewhere he taps Solinus at second hand through the medium of Isidore.[446] LAMBERT’S “LIBER FLORIDUS;” GUIDO’S ENCYCLOPEDIA Dating from approximately the same period is a similar work, the _Liber floridus_ of Lambert. Practically all we know of the author is that he was a canon of St. Omer early in the twelfth century.[447] His book, a hodgepodge of notices, geographical and otherwise, from Isidore, Bede, Martianus Capella, Raban Maur, and others, though it did not enjoy popularity comparable to that of the _De imagine mundi_, nevertheless by no means lapsed into obscurity during the centuries that followed. There are at least eight manuscripts of it preserved in the libraries of Europe, and it was referred to with high praise by writers of the thirteenth century.[448] The manuscripts are illustrated by crude maps, among the few remaining relics of twelfth-century cartography. Of much the same nature is an encyclopedic compilation made by a certain Guido, probably an Italian, in 1119.[449] It contains excerpts from a variety of sources, including Isidore, the Romance of Alexander, Paul the Deacon, and, more especially, the anonymous Ravenna geographer. “LUCIDARIUS”