This painting shows the establishment of the Academy of Sciences in France in 1666, during the reign of Louis XIV. Christiaan Huygens was one of the founding members of the Academy, and he lived in Paris from 1666 to 1681. Research done by C.J. (Kees) Verduin indicates that there may be an unknown portrait of Christian Huygens in this painting, which now hangs in the Musée National du Château et des Trianons in Versailles.
Go to A Portrait of Christiaan Huygens for more information on his research.
He also has a Christiaan Huygens web page here.