Signed and dated 1766 on the lower right step, the portrait represents the newly elected Senator of Rome, Abbondio Rezzonico, nephew of Pope Clement XIII. The size of the painting, almost three meters by two, is proportional to the importance of the office, at that time the highest civil magistracy assigned by direct appointment of the pontiff. The dress is an encyclopedia of fabrics ranging from the golden brocade of the cloak to the red silk of the robe, to the lace of the collar. The tactile rendering of the fabrics emerges in the heavy fringed curtain folded over the table, in the velvet lining the sword, in the brocade of the chair. The right hand of the portrayed holds the small ivory scepter, while the left rests on the console near the wide-brimmed hat. Furthermore, the inkwell, the bell and a letter addressed to him, perhaps some deed waiting to be signed, are details that allude to the power and responsibilities of the character. The little putto at the bottom holds a scale, adorned with an olive branch, a symbol of justice that is a guarantee of peace. On the floor there is the fasces, a mark of authority by ancient Roman tradition. The artist designed the setting in a scenographic, symbolic and unrealistic way. In fact, the statue of the goddess Rome, with spear, helmet and sphere, which appears behind Rezzonico, is actually located at the entrance to the Palazzo Senatorio, of which the facade that closes the Piazza del Campidoglio can be glimpsed in the background. The representation follows the conventions of official portraiture, in order to provide us with all the necessary clues to understand who the illustrious character is, what he does and where he exercises his functions. In 2016 the painting was purchased by the state to be exhibited at Palazzo Barberini.