Yucatan Before and After the Conquest, by Diego de Landa, tr. William Gates, [1937], at sacred-texts.com
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Yucatan in 1579 Showing the Pre-Spanish Maya Chiefdoms (p. 136 and 137)
The above map, while actually one of northern Yucatan "as Landa left it," and to be used particularly with the facts given in the Appendix to this volume, also shows quite dearly some of the different historical changes in occupation and population. The Eighth Century movement in the Sierra district, of which we knew almost nothing, appears in the concentration of ruined sites. The distinction between the East and West, involved in both the early
[paragraph continues] Mexicanization and later Hispanization of the West, with an outpost at Saci-Valladolid, and the Sacred Well, with its Xiu dominance, shows clearly. By 1579 the West had settled to the 'Spanish form of government,' as ordered on Juan Xiu, while in the East we have only the surviving trails, (taken from the Espinosa map), to suggest the ancient population and the seaward movement to the 'Honduras trade.' The map thus shows, just as does the present volume, that we are not at the end but only the beginning of our historical Maya or Itzá research.