About the Codex (from Wikipedia):
The Codex Mendoza is an Aztec codex, created fourteen years after the 1521 Spanish conquest of Mexico with the intent that it be seen by Charles V, the Holy Roman Emperor and King of Spain. It contains a history of the Aztec rulers and their conquests, a list of the tribute paid by the conquered, and a description of daily Aztec life, in traditional Aztec pictograms with Spanish explanations and commentary.
The codex is named after Don Antonio de Mendoza, then the viceroy of New Spain, who may have commissioned it. It is also known as the Codex Mendocino and La colección Mendoza, and has been held at the Bodleian Library at Oxford University since 1659. It was removed from public exhibition on 23 December 2011.
The Bodleian Library holds four other Mesoamerican codices: Codex Bodley, Codex Laud, Codex Selden and the Selden Roll.