[2] The Köprülü rise to power was precipitated by a political crisis resulting from the government's financial struggles combined with a pressing need to break the Venetian blockade of the Dardanelles in the ongoing Cretan War.
[3][4] Thus, in September 1656 Valide Sultan Turhan Hatice selected Köprülü Mehmed Pasha as grand vizier, as well as guaranteeing him absolute security of office.
He conquered Nové Zámky (Turkish Uyvar) from the Habsburgs in 1663, concluded the Cretan War with the conquest of Heraklion (Kandiye) in 1669, and annexed Kamianets-Podilskyi (Kamaniçe) from the Polish–Lithuanian Commonwealth in 1672.
This policy of aggressive expansion, continued by Fazıl Ahmed's brother-in-law and successor Merzifonlu Kara Mustafa Pasha, expanded the borders of the Ottoman Empire to their greatest extent in Europe.
However, attempts to regain further territory were unsuccessful, and following defeat in the Battle of Zenta in 1697 they were forced to recognize their inability to reconquer the lost Hungarian lands.
Despite the court's approval of much of the Kadızadeli program, the group was regarded negatively by many of the empire's Muslim intellectuals, such as Kâtib Çelebi and Mustafa Naima, who viewed them as backwards-thinking and overly reactionary.
After the initial shock of the loss of Hungary, the empire's leadership began an enthusiastic process of reform intended to strengthen the state's military and fiscal organization.