The first mention dates back to August 14, 1358, when a chronicler noted Goniądz as a seat of a powiat within the land of Wizna.
He was marshal of the Sejm in 1740, a deputy to the Crown Tribunal, cześnik of Wizna from 1703, stolnik, łowczy and pisarz of Bielsk, podstarości, podstoli and sędzia grodzki (judge) of Brańsk.
Originally, their main settlements were in the area of Płock, Łomża, Wizna, Czersk, Ciechanów, Płońsk, Zakroczym and Grójec.
As the oldest son Siemowit obtained the central part of Masovia, with Rawa Mazowiecka (capital) Sochaczew, Zakroczym, Gostynin, Ciechanów and Wizna.
When Casimir III the Great died in 1370, under agreements concluded with one of his lifetime friends Siemowit III, he freed Siemowit from Polish suzerainty and gave Płock, Wizna, Wyszogród and Zakroczym back to Mazovia.
Duke Siemowit, being ambitious, was very active in politics of the period and thus needed cash to finance his policies so several times he mortgaged some of his domains to the Teutonic Order, including Wizna, Zawkrze and Płońsk.
Siemowit V (also spelled Ziemowit; 1389 – 16 February 1442) was from 1426-1434 a Prince of Masovia in Rawa, Plock, Sochaczew, Gostynin, Płońsk, Wizna and Belz i.e., hereditary vassal Polish, the breakdown in 1434 goes as follows; prince of Rawa, Gostynin and Sochaczew.
Wizna | Battle of Wizna |
After the outbreak of the war, Olszyna-Wilczyński's unit was to prepare the defense of the area between Biebrza River, Suwałki, and Wizna.
Ignacy, the third son of Jan (castellan of Wizna, near Łomza), and Ewa Trojanowska, brother of Adam (a bishop), and Michał Hieronim Krasiński (great-grandfather of world famous Polish poet, Count Zygmunt Krasiński).