The Early Medieval Period in Croatia has left us with quite a significant amount of inscriptions through which we can observe that period. In addition to aiding us in research of Croatian rulers and their titles, these inscriptions also offer an insight into the people's religious life. Among other things, they provide information about fulfilled vows, saints to whom a church is dedicated, and dogmatic, biblical and liturgical phrases. This thesis' epigraphical corpus is limited to the territory of early medieval Croatia (without the territory of modern Bosnia and Herzegovina), Dalmatia and Istria. By studying the pertinent literature, 234 Latin inscriptions were identified in the first area, 88 in the second, and 19 in the third. Apart from one inscription on a reliquary and one which is a part of a fresco, all of them are carved in stone. All of the examples which mention saints have been isolated from the epigraphical corpus, after which a study has been made of who they were, and whether their written mention contains any peculiarities. Where possible, an attempt has been made to find a potential source for those peculiarities. All of the mentioned saints have been concisely categorized according to the three pertinent territories by means of a table in the conclusion. The inscriptions which mention God have also been singled out and analyzed, but without territorial categorization because of the likelihood of finding such epigraphic writings. All of the inscriptions stemming from the analyzed territory which are mentioned in the text can be found in the appendix.