The epitaph of Priest Iohannes (CIL III 9527, Salona, August 13, 599 or AD 603) is one of the few inscriptions from the sixth-century Salona, which can be dated with precision. It is also one of the rare inscriptions from Dalmatia of this period, which mention a person (proconsul Marcellinus) known from other sources (Registrum epistularum of Pope Gregory the Great). However, its linguistic importance seems to be summarized in the remark of its most recent editor Nancy Gauthier (2010) that the language of the epitaph reflects the features of Latin spoken in Dalmatia at the time (“la langue vivante”). The aim of this paper was to check the plausibility of this statement by comparing the Vulgar Latin features in the inscription with the results of research on Latin in late Dalmatia. Also, a new interpretation of the word obsis l. 13 is proposed.