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The article is about the Church of St. James in Toruń, which underwent archaeological research between 2008 and 2020. The author’s goal was to present the most important findings and the conclusions drawn upon them. During excavations, numerous traces of architectural alterations and pieces of sacrum furnishings were discovered. Examination of the foundations and stratification, as well as OSL dating of the bricks, proved that construction of the parish church in the Nowe Miasto Toruń began shortly after the city’s foundation (1264). This structure was destroyed in the 13th century. Analyses have revealed that the year 1309, previously considered the beginning of the parish church’s construction, denotes to the construction of the new, second chancel. The basilica structure of the Nowe Miasto Toruń parish church, from the foundations to the roofing of the nave, was built in stages, from approximately the 3rd quarter of the 13th century to 1368. During the 15th century, chapels were built on arcaded foundations. After 1667, the old monastery was joined to the chancel by a corridor, and the claustrum was expanded. From the 13th century, baptisms were performed at a stone baptismal font. In the 15th and 16th centuries, the interior was decorated with a floor adorned with flour de lis; a tombstone lay in the Chapel of St. Valentine, and a stone washbasin was used for ablutions in the sacristy. This article points to the importance of archaeology in understanding the architectural history and the origins of Toruń’s Nowe Miasto, thanks to interdisciplinary research on the Toruń church, considered a gem of Gothic architecture of Pomerania.