Geertruy Haeck-van Slingelandt van der Tempel was a 15th-century Dutch patrician woman.

Life Geertruy was married to Adriaen Hermansz. Haeck,D.P. Blok, Algemene geschiedenis der Nederlanden, vol. 4 (1980), p. 396. who served as mayor of Dordrecht 1443–44 and 1446–48.Matthys Balen, Beschryvinge der stad Dordrecht, vol. 1 (Dordrecht, 1667), p. 243. After being widowed she entered the congregation of canonesses regular of St Agnes (Sint-Agnesklooster).

Portrait Around 1465 Haeck had her portrait painted kneeling in veneration of St Agnes. This portrait was bought by the Rijksmuseum, Amsterdam, in 1957 for £4,300.Geertruy Haeck-van Slingelandt van der Tempel kneeling in prayer before St Agnes, Rijksmuseum Catalogue. Accessed 10 March 2016.

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