Together Allard de la Court and Catharina Backer owned one of the richest art galleries in the Northern Netherlands.
Arnold Boonen (1669–1729) painted their portraits in 1713 as part of a series of four that included her two sisters. After the deaths of their fathers in the 1730s, Allard de la Court and Catharina Backer inherited some of the art that their fathers had collected, although a pair of 1635 portraits by
Pieter Dubordieu (1609–78) of their mutual great-grandparents, Pieter de la Court the Elder (1590–1657) and Jeanne des Planques (or Jeanne de Planque, 1591–1663), appears to have passed first to Allard's sister, Adriana Catharina de la Court (1690–1752), before entering Allard's collection following her death. Pieter de la Court van der Voort had been an important patron of
Willem van Mieris (1662–1747) and commissioned a pair of paintings,
still lifes of fruit and flowers, from
Rachel Ruysch (1664–1750). These works became important in Catharina Backer's development as an artist. Her father, Willem Backer, had collected specimens of
natural history as well as paintings by artists such as
Jan van Goyen (1596–1656),
Jan Lievens (1607–1674),
Frederik de Moucheron (1633–1686), and
Jan van der Heyden (1637–1712). Allard de la Court's spending on art increased after his mother died in 1740, and the art collection grew to completely fill the house on the Rapenburg, compelling the family to seek a new residence. After her husband died in 1755, Backer inherited his art collection. She continued to show and add to the cabinet. In 1766, the year that she died, her estate sold much of her art collection with an auction catalog listing 215 items, including the pair of paintings by Rachel Ruysch. Her own artworks stayed in the family for another century. == Drawing and painting ==