This is Engel de Ruyter, the 20-year-old son of Admiral Michiel de Ruyter. Like his father, he had his portrait painted by Ferdinand Bol, who portrayed Engel as a ruler, despite his youth.
The gilt frame of the painting is original. It is richly decorated with attributes that refer to the navy.
Probably the portrait inventoried in the house of the sitter, Amsterdam, 1683; purchased, presumably in 1817 (first mentioned in 1822)