Stanislaw August Poniatowski in Coronation Robes (1732 - 1798).
Marcello Bacciarelli, about 1768 - 1771.
King of Poland 1764 - 1795. Assuming the throne he had a comprehensive program of civilizational, cultural and political changes. He wanted to introduce reforms wherever possible, though Catherine II spared no effort to make that impossible.
(Collection of Royal Castle in Wasaw)