During the Dutch Golden Age, the Bicker family was very critical of the influence of the House of Orange. They belonged to the republican political movement, also referred to as the ‘state oriented’, as opposed to the Royalists. Together with the Republican political leader Grand PensionaryJohan de Witt and the republican-minded Cornelis de Graeff, the Bickers strived for the abolition of stadtholdership. They desired the full sovereignty of the individual regions in a form in which the Republic of the United Seven Netherlands was not ruled by a single person. Instead of a sovereign the political and military power was lodged with the States General and with the regents of the cities in Holland. During the two decades from the 1630 to the 1650s the Bicker family had a leading role in the Amsterdam administration, the city was at the peak of its political power. In 1646, seven members of the Bicker family, called the Bicker's league, simultaneously held some political position or other. The Bickers provided silver and ships to Spain, and were very much interested in ending the Eighty Years War. This brought them in conflict with the stadtholder, some provinces, like Zeeland and Utrecht, and the Reformed preachers. After the Peace of Münster was signed, the Bickers were of the opinion that it was no longer necessary to maintain a standing army, bringing them into vehement conflict with prince Willem II. To regain power William went on the march towards Dordrecht and Amsterdam with an army. His troops got lost in a dense fog and were discovered by the postal courier on Hamburg. The mayors of Amsterdam had the civic guard called out, the bridges raised, the gates closed and the artillery dragged into position. After that the leader of the family, Andries Bicker, was purged from the vroedschap, as was his brother Cornelis Bicker, as one of the conditions of the treaty that followed, led by Joan Huydecoper van Maarsseveen. Henceforth, it was the equally republican-minded brothers Cornelis and Andries de Graeff, and their following, who dominated Amsterdam. His niece Wendela Bicker married the raadspensionaris Johan de Witt.
* Andries Bicker, was a wealthy merchant on Russia, Amsterdam regent, burgemeester and member of the vroedschap, the leader of the Arminians, an administrator of the Dutch East India Company, representative of the States-General of the Netherlands, Lord of Engelenburg etc.
* Jan Bicker, Amsterdam politician, shipbuilder and merchant
** Wendela Bicker, wife of Johan de Witt
* Cornelis Bicker, Burgemeester of Amsterdam, Lord of Swieten, an administrator of the Dutch East India Company
Laurens Bicker, Dutch admiral, trader and merchant at Guinea
