Until the Germanic invasion of the Wendish Crusade the Principality of Kopanica, supported by ancient noble families (Spyra, Duninowie…) from Silesia, issued at least five emissions of the brakteate of Iakša. Those brakteates from silver mines of Rozbark (today district of Bytom) of the Spyra dynasty (ancestors of parts of the Piast dynasty) were minted by Iakša's father-in-law Piotr Włostowic at Ołbin (Wrocław), then still Kingdom of Poland.
The ducal cape found in the Eberswalde Hoard from Finów shows the eight-petaled star of Svarog, a Slavic deity.
Etymology
The Slavic (Veneti) name Kopnik means a place at which some kind of digging related to irrigating, building, mining, also building a kopiec (kurhan, kurgan, tumulus, barrow, mound) is being performed. Kopanica means an area belonging to or surrounding the place of Kopnik. Kopa is the name often used for mountains, also the original Vindelici name for the main mountain massive hosting kopalnie (mines) of the Hallstatt culture.
Branibor means the protecting forest/woods and is still used for this area by the Czechs.
Iakša (Jakša, Jaksa, Jaxa, Iacza, Jacek…) is derived from the Slavic root iskati meaning to strike/split/sliver [stones], to make sparks/light, to glitter/shine and is related to such ancient names as Iskra (spark), Iškur (lord of the sparks/thunderbolts)[citation needed].
Geography
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.
Cetwiński, Marek (1980). Rycerstwo Śląskie do końca XIII w. Pochodzenie. Gospodarka. Polityka. Wrocławskie Towarzystwo Naukowe. p. 70.
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