In the 13th and 14th centuries, Lithuania’s neighbours were already Christians: Orthodox to the east, Catholics to the north and south. Members of these two branches of Christianity met in pagan Vilnius, which was already looking at choosing a new faith. By consolidating historical, archaeological, architectural and geological sources, this article explores the reasons for and the circumstances of Christian settlement in pagan Vilnius, analyses the living spaces of both communities, and aims to determine the importance of Christians and the changes to their role in developing Vilnius. Differences between the Orthodox and Catholic communities are emphasised, but points of connection between the two communities are also sought. The position of Christians in the town reflects the generic state of emerging Vilnius, is inseparably intertwined with shifts in its history, and also shows how Lithuania’s rulers wavered between the Latin and Greek rites.