From the foregoing list of maps the following interesting points are to be gleaned:
1. Yucatan does not appear on any map prior to 1523-1525. From the time of its first discovery Yucatan was believed to be an island. Maps vary greatly as to what sort of an island it was.
2. In 1527 the Weimar-Spanish map shows Yucatan for the first time as a peninsula. Probably the maker of this map derived his information from someone who had been with Cortes in 1524-1525. The name Ytza appears on the isthmus; it is so faint as to be almost illegible, but I think I have deciphered it correctly.
3. From 1529 (Ribero) to 1548 (Venice "Ptolemy") geographical knowledge of Yucatan falls off badly. With only two exceptions (Mercator, 1536, and Santa Cruz, 1542) the maps of this period show Yucatan as an island more or less remote from the mainland. I think that the comparative accuracy of Alonso de Santa Cruz is accounted for by the fact that he was official cartographer to the crown of Castile and that he had official information of Montejo's explorations, 1526-1541.
4. From 1551 onward Yucatan is usually shown as a peninsula; but even so late as this there are exceptions such as Ferrando Berteli, 1560, and Gulielmus Nicolai, 1603, whose inaccuracies are many.
5. In Sanson d'Abbeville, 1656, the Itzas appear again, this time under the name of Yzues. They and the Cocomes are misplaced, being too far north. It is barely possible that the entradas of Fuensalida and Orbita and Delgado, 1618-1624, may have had some influence on this map.
6. In Blaauw, 1667, we have the first step toward a really accurate map of Yucatan. This map bears many place names, among them the Yzaes and the Cocomes.
7. About 1714 Henry Popple, the great London map maker, made an excellent map of the region. On it Lake Peten is rightly located. There can be but little doubt that Popple derived his information from the English in British Honduras. Through them he probably learned of the conquest of the Itzas. It is not impossible, of course, that he was also acquainted with the writings of Cogolludo and Villagutierre, but that does not seem very likely. From that time onward the Itzas have appeared regularly on the maps of that region.