The contribution aims to outline the goals, the methodological framework and the encoding practices, used in the project Unknown Early Modern Manuscripts of Slovenian Literature. Our research of primary sources focused on those manuscripts that remained unknown or left out of research until recently. The study indicated that the majority of manuscripts remained out of the scholarly evidence mostly because of their pre-modern characteristics. This applies especially to the content of these manuscripts, originating from mystical and pseudo-mystical currents of baroque culture, which has been later rejected by rationalistic enlightenment paradigm. In literary studies, this state of art remained in force until recently. The main results of the research up to date are embodied in the on-line portal <http://ezb.ijs.si/nrss/&gt; with the Register of the manuscripts and the bibliographic resources. Each manuscript is presented by means of structured TEI-encoded description and by digital facsimile. To date, the first hundred manuscripts are published here as the beginning of a systematic long-term research – and as a venue to a more broad and more varied readers' reception of the older Slovenian, mostly unknown, literary and religious texts.