vi the middle and end of the 1st century show that the official form of the name at that time was Pontus and Bithynia, despite the larger part of the province belonging to Bithynia. In several inscriptions, as well as from the historical records of Tacitus and Cassius Dio, a colloquial reference only to Bithynia appeared. In turn, in most epigraphic sources, dated to the end of the 2nd and into the 3rd century, the form of the name used at that time was Bithynia and Pontus. 8 It is also worth noting that in the correspondence of Pliny there is a reference to the latter. 9 In modern studies, this form is very often used, with some researchers also referring to the official name of Pontus and Bithynia. In this case, due to the correspondence of Pliny, the name of the province was adopted as Bithynia and Pontus. It should also be emphasised that the work sometimes includes colloquial references to the name of the province or geographic country within which a given town was located. In the case of individual modern Turkish names of cities, provinces or districts, the original spelling was left. The legends placed on the coins in the work, both in Greek and Latin, as well as the individual nicknames of the emperor, remain in the original, with their translation and meaning discussed in a separate chapter.All dates quoted in the work referring to times before Christ are abbreviated 'BC'. The exceptions in this case are the dates in parentheses relating to the reigns of rulers or historical events. The rest of the dates written without marking are Anno Domini (AD).tips and comments on this work, and, above all, for instilling a passion for numismatics during my studies.I would like to thank the National Science Centre, for the opportunity to implement the project under the grant Preludium 15, realised between 2019-2023 (UMO-2018/29/N/HS3/01434).Thanks to the funds granted, it was possible to conduct many queries in various institutions, both museums and libraries, enabling the acquisition and verification of individual information necessary for the analysis of the Roman provincial coinage of Bithynia and Pontus during the