The article discusses an ancient marble capital found in 1970s in the park Arkadia near Nieborów, Masowia, that until 1820s belonged to the prince Michal and Helena Radziwill. The capital was first published in 2001 and dated to the 3rd-4th cent. AD. The present authoress, however, argues for its dating to the second half of the 5th cent., pointing to similar Corinthian capitals from Constantinople, Ravenna, Rome, Venice and Chersonesus. The capital's dimensions (lower diam. 56 cm) suggest that it originally topped a free-standing (honorific?) column. It is likely to have been brought to Arkadia via Sankt Petersburg at the turn of the 18th and 19th centuries.