This article is devoted to the analysis of the portrait of an unknown architect from the collection of the Jagiellonian University Museum. A compass in his right hand and a project in gothic or neogothic style suggest an architect meanwhile the dress on the model is chacteristic for the first decade of the 20 c. Finaly it was discovered that the model was an excellent architect Teodor Talowski, also the temple visible on the project within this portrait was identyfied as the church of St. Elisabeth in Lwów. Next question was the identity of the painter.
It was possible to discover the correspondence between the painter Tadeusz Popiel with Teodor Talowski revealing that the architect was an intermediary between the painter, Popiel and the professors of Lwów Polytechnic in ordering their portraits. While it seemed certain that he did paint the portait in question, one more decisive comparative prove was needed. One authoportrait of Tadeusz Popiel in the dress of chamberlain from 1907 solved the mystery because it is so much similar in many aspects to the portrait of the architect Teodor Talowski. The portrait was painted round 1903. It must have been hanging in the hall of the Polytechnic of Lwów. The portrait of Talowski was purchased by the Jagiellonian University Museum from Mrs Hamerlak-Mleczko in 1975.