The Popol Vuh is one of the most famous books in ancient Mayan which is held in the Newberry Library. There are, however, other important Mayan manuscripts in the collection that are less well known. One important example is the Ars Tzeldaica, the first text about the Tzeltallanguage by Fray Domingo de Hara, which was produced a century before the Popol Vuh. Remarkably, it has still not yet been published. In this presentation, Herendira Tellez-Nieto will talk about this and other early Mayan manuscripts, and their importance for Mexican and Mesoamerican history.