In this paper, a linguistic analysis of the Itinerarium Egeriae, one of the oldest documented Christian pilgrimages to the eastern Mediterranean, is presented. The aim of the work is to present characteristics related to Vulgar Latin. The linguistic analysis is focused on characteristics which are not in keeping with classical norms, in an attempt to describe certain changes with regard to Classical Latin and traditional grammar, which may cause difficulty for the reader. It is evident that the Itinerarium Egeriae is not characterized by ornate expression like the texts of classical writers, but it offers interesting, if sometimes confusing, deviations from classical norms. The paper is divided into two parts. In the first section Egeria, the purpose of the trip, the text, the author’s ability to observe, and her style aimed at spiritual instruction are presented. Egeria’s style of Latin are the subject of the second and main section of the work, which includes language, style, literary aspect and phonological, morphological, syntactic and lexical characteristics of travel writing.