Agneta de Graeff van Polsbroek
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Agneta de Graeff van Polsbroek (Amsterdam, 10 November 1603 ibid 3 or 4 March 1656), was a patrician woman from the Dutch Golden Age. She became known as the mother-in-law of Johan de Witt.


Agneta was a scion of the De Graeff family and born as the oldest daughter of Jacob Dircksz de Graeff and Aeltje Boelens Loen (1579-1630),[1] herself daughter of the politician Cornelis Andriesz Boelens Loen (1552-1584), great-grandson of Andries Boelens (1455–1519), a famous regent of Amsterdam. In 1625 she was married to later Amsterdam burgomaster Jan Bicker.[2] The couple had five daughters:[3][4]
- Elisabeth Bicker (1630–1660) married Jacobus Trip, a wealthy arms dealer
- Geertruida Bicker (1634–1702) married Jean Deutz, a rich Banker and Investor of Amsterdam
- Wendela Bicker (1635–1668) married Johan de Witt[5]
- Cornelia Bicker (1638–1665), married her full cousin Gerard Bicker (I) van Swieten
- Jacoba Bicker (1640–1695) married her full cousin Pieter de Graeff[6]
The couple lived at their country houses De Eult at Baarn, Akerendam and Duynwijck in Beverwijk. Between the city of Amsterdam they owned a cityhause at Herengracht and an island, called Bickerseiland.[1] In 1663/64 Agneta was painted by Wallerant Vaillant.[7] Her tomb chapel is located at the Westerkerk.
