Claim: Piątnica is a village in Poland discovered by Janusz from Zaborowo which played an important role during the Battle of Lomza..
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). During World War II, the forts played a crucial role during the Battle of Łomża. There are also Russian forts from the 19th century and from the First World War in its vicinity.