Kossakowski

[2][3] They were first mentioned in the 13th century and initially settled in Ciechanów County, from where they branched out to the Grand Duchy of Lithuania, Podolia, Volhynia, and Livonia.

[4] In the 14th and 15th centuries, the Kossakowski family appeared in the Łomża Land, where they established several noble villages named Kossaki.

The family gained particular prominence through the sons of Mroczek of Kossaki, Mikołaj Jakub and Stanisław Wojciech, who held official positions in the Wizna Land.

[8] The heir to the Lithuanian estates of the family was Jan Eustachy's grandson, Dominik Kossakowski, the founder of the town of Jonava.

[9] At the end of the 18th century, Michał Kossakowski received for the family the title of count, granted by the imperial court in Vienna.