The territory of the Principality of Kopanica, named after its capital Kopnik consisted of central and eastern parts of Branibor, which was later eventually renamed Brandenburg.
In the late 12th century, in the west it bordered other territories of the Polabian Slavs (Veneti) and in the south White Serbia of the Serbs, which were annexed into Germanic Holy Roman Empire.
In the east the Principality of Kopanica bordered the Kingdom of Poland, which it was a fief of.

From 1153/1154 to 1157 the Slavic settlement Branibor was part of the Duchy, until it was conquered by Albert the Bear and under the German name of Brandenburg it became capital of the newly established March of Brandenburg.

When in the years 1298-1405 the Kingdom of Bohemia incorporated the former White Serbia bordering Principality of Kopanica to the south it failed to incorporate their Slavic kinsmen of Kopanica and Branibor into their kingdom.
Kingdom of Poland weakened by the Turko-Mongol invasions (up to 75% of casualties) also failed to recapture its fief.
The territory of the Principality of Kopanica, named after its capital Kopnik consisted of central and eastern parts of Branibor, which was later eventually renamed Brandenburg. In the late 12th century, in the west it bordered other territories of the Polabian Slavs (Veneti) and in the south White Serbia of the Serbs, which were annexed into Germanic Holy Roman Empire. In the east the Principality of Kopanica bordered the Kingdom of Poland, which it was a fief of.
From 1153/1154 to 1157 the Slavic settlement Branibor was part of the Duchy, until it was conquered by Albert the Bear and under the German name of Brandenburg it became capital of the newly established March of Brandenburg. 
When in the years 1298-1405 the Kingdom of Bohemia incorporated the former White Serbia bordering Principality of Kopanica to the south it failed to incorporate their Slavic kinsmen of Kopanica and Branibor into their kingdom. Kingdom of Poland weakened by the Turko-Mongol invasions (up to 75% of casualties) also failed to recapture its fief.
Duchy of Kopanica