Later indigenous literature employed Latin script exclusively, e.g., the Books of Chilam Balam that date from the 17th c. onwards. Already by the mid-16th c., use of the Latin script for Mesoamerican languages seems to have been well established. For writing Maya, colonial manuscripts conventionally adopt a number of special characters and diacritics thought to have been invented by Francisco de la Parra around 1545. The original manuscript of the Popol Vuh is also dated to this period (but only indirectly, by its content). The first major work of Mayan literature known to be originally written in Latin script are the Annals of the Cakchiquels (since 1571).