In this dataset the user will find a collection of 75 interactive diachronic maps of the lexical modal markers analyzed in the framework of the WoPoss project (https://woposs.unine.ch/). The drawing of the maps is based on the descriptions of the lemmas in the Thesaurus Linguae Latinae, combined with the personal analysis of the relevant Latin passages carried out by the authors. As the Thesaurus Linguae Latinae is still under construction, for the lemmas nolo, (ne)queo, usus, valeo, volo and voluntas we relied on the Oxford Latin Dictionary. The maps are in json format and can be visualized on the Pygmalion platform at https://woposs.unine.ch/map.php. More detailed information is provided in the README file.