Soli or Só was the medieval name of a small region in today's northern Bosnia and Herzegovina, centered in the town of Tuzla. Initially, a Slavic župa, the Banate of Só became an administrative division of the Kingdom of Hungary. The meaning of the name is "salts". With the arrival of the Ottoman Empire around 1512, the names of the villages "Gornje Soli" and "Donje Soli" were translated to "Memlehai-bala" and "Memlehai-zir", literally meaning Upper and Lower Saltworks, resp.
- The Oxford Encyclopedia of Medieval Warfare and Military Technology, Volume 1, Clifford Rogers, Oxford University Press, 2010, p. 117
- Cumans and Tatars: Oriental Military in the Pre-Ottoman Balkans, 1185-1365, István Vásáry, Cambridge University Press, 2005, p. 103
- Pavo Živković, Marija Brandić (May 2007). "Usora i Soli u prva dva stoljeća turske prevlasti". Povijesni zbornik: godišnjak za kulturu i povijesno nasljeđe (in Croatian). Faculty of Philosophy, University of Osijek. 1 (1-2): 58–59. ISSN 1846-3819. Retrieved 2012-09-02.
- Fine, John Van Antwerp Jr. (1994). The Late Medieval Balkans: A Critical Survey from the Late Twelfth Century to the Ottoman Conquest. The University of Michigan Press.