 Only 15 codices survived after 1521; these include the Borgia codex, the Vatican B codex, and the Tro-Cortesiano codex.However, codices were slow to die out; Spanish-language, bilingual, and indigenous-language codices continued to be produced, with the list of materials changing to include paper and the subjects focusing on the Christian religion and tribute to colonial administrators.One such example is the Codex Mendoza; it contains ethnography of the Aztecs with a commentary by Spanish priests and was created in 1541 as a gift for Charles V of Spain.