The Nieszawa Privileges-'Conventiones Particulares'

After the concessions to the Nobility in 1425 and during the Thirteen Years War Kazimierz IV was again forced to new concessions. To be able to raise troops, among them a lot of mercenaries, the King needed money from the Szlachta. In an effort to solve the monarchy's pressing problems he had to accept the Nieszawa Privileges implying that the Nobility had the right to hold local Conventiones Particulares, without which no troops could be raised and no taxes extracted. In this way the Nobility got an efficient and powerful organization with a joint mutual interest, and power of the military and the taxation legislative procedure.