Duchy of Oświęcim
First documented mention of Brzeszcze comes from 1438, when the village was part of the Duchy of Oświęcim, a fee of the Kingdom of Bohemia. In 1457 Jan IV of Oświęcim agreed to sell the duchy to the Polish Crown, and in the accompanying document issued on 21 February the village was mentioned as "Brzescze". The territory of the Duchy of Oświęcim was eventually incorporated into Poland in 1564 and formed Silesian County of Kraków Voivodeship.