Mesoamerican Codices
Mesoamerican codices are manuscripts that present traits of the Mesoamerican indigenous pictoric tradition, either in content, style, or in regards to their symbolic conventions. The unambiguous presence of Mesoamerican writing systems in some of these documents is also an important, but not defining, characteristic, for Mesoamerican codices can comprise pure pictorials, native cartographies with no traces of glyphs on them, or colonial alphabetic texts with indigenous illustrations. Perhaps the best-known examples among such documents are Aztec Codices, Maya Codices, and Mixtec Codices, but other cultures such as the Tlaxcaltec, the Purepecha, the Otomi, the Zapotec, and the  Cuicatec, are creators of equally relevant manuscripts. Formats. During the 19th century, the word 'codex' became popular to designate any pictorial manuscript in the Mesoamerican tradition. In reality, pre-Columbian manuscripts are, strictly speaking, not codices, since the strict librarian usage of the word denotes manuscript books made of vellum, papyrus and other materials besides paper, that have been sewn on one side. Instead, precolumbian pictorials were made in native, non-codical formats, some of these being the following: Classification. According to Donald Robertson and John B. Glass, the first scholars to propose a comprehensive census of such documents, five  categories can be discerned among them. The first is that of traditional pictorials (which we will name "traditional codexes" in this article), comprising numbers 1-599 in their catalog. The second is that of paintings and maps from the Relaciones Geográficas, a set of questionnaires elaborated by the colonial bureaucracy of the Spanish Empire during the reign of Phillip II (numbers 601-699). The third category is that of Techialoyan manuscripts, a number of late colonial manuscripts created during the 17th century with the intention to serve as legal documents for indigenous communities, which display a noticeable similarity in style  and format, as well as sharing a regional origin (numbers 701-799). The fourth category is that of pictorial cathecisms, also known as Testerian cathecisms (numbers 801-899). The fifth category is that of falsified pictorials. Finally, the category of nonpictorial texts which describe pictorials is contemplated, but not used, by Robertson and Glass (numbers 1000 and up), but examples of such documents exist too. Besides this primary classification, these documents can be further classified according to their origin, their region, and subject, Thus, in regards to their origin, manuscripts can be distinguished as pre-Columbian (like those of the  Borgia group), those produced under Spanish patronage (the Codex Mendoza being a notable example), native colonial (for example, Codex Xolotl), and mixed colonial (like the Lienzo de Tlaxcala). In regards to their topic, these documents can be classified as dealing with the following topics: ritual-calendrical, historical, genealogical, cartographic, cartographic-historical, economic, ethnographic, and miscellaneous. These manuscripts can comprise many regions: Western Mexico (mainly Michoacan), Central Mexico (Mexico City and the State of Mexico, Guerrero, Hidalgo, Morelos, Puebla, Tlaxcala and Veracruz), Oaxaca, Southeast Mexico (Chiapas and Yucatan) and Guatemala. Regional schools have been identified: the classic division in the Central  Mexican region was proposed by Donald Robertson, who distinguished among them the schools of Tenochtitlan, Tlatelolco and Tezcoco. Traditional Mesoamerican codices. This category comprises most pre-Columbian and colonial Mesoamerican pictorials, and is by far the best-known and studied. Individual manuscripts in this category are numerous, totalling 434 in Robertson and Glass original census, and their number keeps increasing thanks to the discovery of new native traditional codices in Mexican villages. An example of a recent addition would be the Codex Cuaxicala, a pictorial document from the 16th century currently kept by the homonymous community of Huachinango, Puebla. A  list of the most representative manuscripts from this category would be the following: Within these categories, some sub-groupings of codices that are closely related in subject or that share a common prototype exist. Among the most famous are the following: Paintings from the "Relaciones Geográficas". This group comprises all the paintings and illustrations from the "Relaciones Geográficas," a series of documents produced as a result of questionnaires distributed to the territories under the jurisdiction of Phillip the Second, King of Spain, during the years 1579–1585. Besides their invaluable ethnohistorical, ethnological and geographical data, the "Relaciones" often includes a series  of paintings and maps, some considered to display elements of the native cartographical tradition. Techialoyan manuscripts. The Techialoyan manuscripts is a group of indigenous Mexican manuscripts named after the Codex of San Antonio Techialoyan. These documents were produced during the 18th century, and reveal a set of common elements, including the use of amate paper, the presence of Nahuatl alphabetic glosses, their artistic style, their legal purpose and the fact that they were created in a number of villages in and around the State and the valley of Mexico. They were first classified by Robert Barlow. Some of them were  produced by local indigenous artists in order to be recognized as legal documents for the colonial Spanish administration, but were deemed as forgeries. A foremost example of this class is the Codex García Granados. Pictorial cathecisms. Pictorial cathecisms, also known as Testerian manuscripts, are documents containing prayers, articles of faith, or any part of the Catholic cathecism, either drawn or written through mnemonic images or ad-hoc hieroglyphs. They are called "Testerian" because they were once taught to be an invention of the Franciscan friar Jacobo de Testera; however, most documents of this tradition are unrelated to Testera, who was  not even the first friar to use them. For this reason, some scholars consider them as being an indigenous rather than a Spanish creation. Therefore, the use of the term has been avoided in recent academic works. Regardless, pictorial cathecisms form a clear group, characterized by the use of a new iconographic and a hieroglyphic repertoire unrelated to that of Mesoamerican cultures. Due to the fragmented and dispersed state of the manuscripts, many of which are still not even individually named yet, the study of this group is still incipient. Relevant works include those of Galarza, Anne Whited Normann, and  Hill-Boone. Falsified codices. This category comprises forgeries created during the 19th and 20th centuries in order to deceive institutions and individual collectors regarding their authenticity. They vary noticeably in their contents, materials and techniques. Some are purely fantastical, while other combine disparate native styles and sources. Materials vary from native amate paper, to agave fibers, parchments, cloth, animals skins and even coconut fiber. Notable examples in this category are the Codex Moguntiacus, the Codex of Lieberec and the Codex Hall. Finally, some recently surfaced documents, like the Codex Cardona, are still waiting to be confirmed as either forgeries, Techialoyan  documents or actual traditional pictorials. Non-pictorial codices. Non pictorial manuscripts describing lost indigenous pictorials are rare; this category was contemplated, but not used, by Glass and Robertson originally, but in recent years such documents have emerged. One such example is the Códice Cabezón, a textual copy of Codex Tudela that was never illustrated, and the Codex Fiestas, a copy of the lost pictorial "Libro de Figuras," although the former contains some sketches of illustrations that were never completed"." Pictography and writing. Much controversy has been dedicated to the relationship between pictures and writing in these documents. While the polemic  has been settled regarding the Maya, whose writing system is recognized nowadays as being logo-syllabic, the relationship between image and writing in non-Maya mesoamerican manuscripts, which comprise a vast majority of these documents, has not reached an academic consensus as of yet. Current specialists are divided between grammatological perspectives, which consider these documents as a mixture of iconography and writing proper, and semasiographical perspectives, which consider them a system of graphic comunication which admits "glottography", or a limited representation of language. In regards to linguistic affiliation, the problem is increased by the fact that some of the foremost  among these documents are for now impossible to assign to any particular language due to the lack of any noticeable phoneticism in them (like Codex Borgia), while some others seems to illustrate Spanish rather than native accounts (like Codex Magliabechiano), or are a mixture of Spanish and native alphabetic glosses with native hieroglyphic writing (like the Codex Mendoza). Thus, the classification of these documents by Glass and Robertson was originally agnostic on the polemic of pictography and hieroglyphic writing, as well as on the linguistic affiliation of these documents.