Jacob Dircksz de Graeff (Emden, 1579/1571 - Amsterdam, 6 October 1636) was one of the most illustrious members of the De Graeff family. He was a powerful member of the States Faction, regent and mayor of Amsterdam after the political collapse of Reinier Pauw in 1627.

In the mid 17th century, during the Dutch Golden Age, De Graeff controlled the city's politics in close cooperation with his nephew Andries Bicker. Together with Bicker he was also the leader of the Arminian faction of the city. Jacob de Graeff was very critical of the Orange family's influence. He was a member of a family of regents who belonged to the republican political movement also referred to as the ‘state oriented’, as opposed to the Royalists.

On September 13, 1610, he bought the lordship of Zuid-Polsbroek from Charles, prince d'Aremberg.

Source: http://en.wikipedia.org/wiki/Jacob_Dircksz_de_Graeff