Now lost, his town house, or 'hôtel particulier, was on rue Neuve-Saint-Merri; he put on plays there, whose audiences included Voltaire, before it became the base of the "Caisse Jabach" Comptoir commercial.
Jabach is most notable as a famous collector of drawings, paintings, sculptures, objets d'art, bronzes, and prints by Raphael, the Caracci brothers, Rubens, Paul Bril, Durer, Le Brun, and Poussin.
In 1661–62 and 1671, he ceded much of his collection to Louis XIV—a total of 5,000 drawings in the second sale, now in the Louvre's Cabinet des dessins.
[1]His portrait was painted by several notable artists of the time, including Rigaud in 1688 and Anthony van Dyck in 1636-37 (now in the Hermitage Museum),[2] whilst he commissioned a group portrait of his family and his collection from Charles LeBrun (since 2014, Metropolitan Museum of Art, a second version having been lost in Berlin in WW2).
Jabach's purchases totaled over twenty paintings of extremely high quality, with the representatives of the King of Spain and the Emperor being the main other competing buyers.