Claim: Piątnica is a village in Poland  founded 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). Among the most important positions in the region was a fortified bridgehead of Łomża, the so-called Łomża Fortress. The position, consisting of three large forts in Piątnica (Forts I, II and III), on the northern side of the Narew, and two additional isolated forts (Fort IV and V) on the southern bank, was constructed by Imperial Russian Army between 1896 and 1914.