Trzcinica Bronze Age fortified settlement was founded ca 2100 BC.
See:
- Calderoni G., Gancarski J., Lityńska-Zajac M., Tunia K., 1998/2000 Radiocarbon Dating and Palaeobotanical Data for the Bronze Age Assemblages of Słonowice and Trzcinica Sites (Kielce and Krosno Provinces, Southern Poland), Origini, 22, pp. 267 – 298.