The relation of postpositional locatives and synonimous prepositional phrases in the text „Knyga nobažnystės“ hasn‘t been analysed wider yet, therefore the theme of this magistral dissertation is urgent and important. The empirical material is collected from the chapter „Suma arba trumpas išguldymas evangelijų šventų“ of the facsimilical publication of the year 2004 of the „Knyga nobažnystės krikščioniškos, 1653). The aim of this work is the analysis of postpositional lokatives and synonimous prepositional phrases. The main problem is to ascertain the postpositional lokatives and synonimous prepositional phrases according to frequency of use; to define the meanings of postpositional lokatives and prepositional phrases; to discuss the rivalry of postpositional lokatives and synonimous prepositional phrases; to describe the tendencies of use of the researched; to compare the use of former postpositional lokatives the with equivalents in modern Lithuanian. Examples of postpositional lokatives – adessive, allative, illative and inessive ���� were selected from the text source mentioned above. Prepositional phrases correlating with them were select too. Every postpositional lokative and its synonimous prepositional phrases are analysed in separate chapters of this dissertation. The selected material is researched using the descriptive analytical, statistic, oppositions and philological methods.