The study presents an analysis of a relief bust from the manor house Jabłonna near Warsaw with the self-portrait of the famous Florentine artist Baccio Bandinelli. Based on a thorough research of the work of art the author dates its origin back to the years 1555 - 1559, integrating it with some self-portraits of the artist from Florence and Strasbourg. He also points to formal features of the relief, which are also characteristic for Bandinelli’s marble slabs for the chancel in Florentine Santa Maria del Fiore (today Museo dell‘ Opera del Duomo). A special issue, which the author raises, are the circumstances that led this work to Poland. The existing sources offer two hypotheses.