Codex Vindobonensis Mexicanus I, also known as Codex Vindobonensis C, or Codex Mexicanus I is an accordion-folded pre-Columbian piece of Mixtec writing. It is a ritual-calendrical and genealogical document dated to the 14th century.
Codex Vindobonensis has 52 pages with size 26.5 by 22 cm. It was composed in a form of harmony with length 13.5 m. Its weight is 2.687 kg. The text is divided into 10 major sections. In the beginning it presents mythological genealogies of gods. It also contains lists of Mixtecian rulers and priests.
It is not certain where the codex was discovered. Probably it was discovered in Veracruz and sent to Sevilla, together with the other manuscript Codex Zouche-Nuttall, as a gift for Charles V in 1519. The later story of the codex is not well known, but it came to Portugal, Rome, Weimar, and Vienna (at last).
The manuscript changed its owners and places in which it was housed. As a result, its name was often changed (18 times). It was known as Codex Constantinopolitanus, Codex Byzantinus, and Codex Mexicanus I. The last name is more often used in the present day.
Currently it is housed at the Austrian National Library at Vienna.