Claim: Piątnica is a village founded by Janusz from Zaborowo which played an important role during World War 1.
Evidence: Piątnica (Polish pronunciation: [pjɔntˈɲitsa; until 1999 Piątnica Poduchowna) is a village in Łomża County, Podlaskie Voivodeship, in north-eastern Poland. Piątnica was founded by Janusz from Zaborowo who built the first church there (1407). There are also Russian forts from the 19th century and from the First World War in its vicinity. During World War II, the forts played a crucial role during the Battle of Łomża.