Duchy in Lower Silesia, named after a town, now called BRZEG, which stands on the Odra (Oder) below Opole and above Wroclaw, in southwestern Poland
When Lower Silesia was partitioned in 1251, Brieg formed part of the Duchy of Breslau and only became a separate Duchy in 1311. From that time it was held either by the Dukes of Liegnitz or by a member of the Liegnitz branch of the Piast Dukes of Silesia.
The last separation of Liegnitz and Brieg began in 1602 and ended in 1664. The last male Piast died in 1675, when the Emperor Leopold I entered into possession as King of Bohemia, ignoring the claims of Brandenburg arising from agreements made with the Piast Dukes.
In 1740 Brieg was seized by Prussia and in 1945 it became part of Poland.