More than a thousand years after the death of St Adalbert's (in slavic languages known as Wojciech) a common memory of the place where it happened was blurred. Since the 19th century, attempts have been made to illuminate this issue using scientific methods. Thanks to modern non-invasive archaeological research, it is possible to re-analyze known historical sources regarding this event. The author's research resulted in determining the probable location of the martyrdom, nearby the stronghold named Cholinun. Reference was made to hagiographic descriptions and the oldest documents regarding ancient Prussia. The topographic fragments of text were combined with the exact terrain shaping obtained using LIDAR and carefully selected aerial photos. In this way, the architectural relics or landscape elements described in historical sources were highly probable. That reconnaissance constitutes a premise for the next step - undertaking field archaeological research.