Florentine Codex is the name given to 12 books created under the supervision of Bernardino de Sahagún between approximately 1540 and 1585. It is a copy of original source materials which are now lost, perhaps destroyed by the Spanish authorities who confiscated Sahagún's manuscripts. The original source materials were records of conversations and interviews with indigenous sources in Tlatelolco, Texcoco, and Tenochtitlan.