Berthold II had inherited the family's Bavarian territories, but also acquired possessions in the adjacent Franconian region, where about 1135 he had the Plassenburg built near Bayreuth and established the town of Kulmbach.
Berthold II mewarisi wilayah keluarga Bayern, namun juga memperoleh harta benda di sekitar wilayah Franken, di mana pada sekitar 1135 ia membangun Plassenburg di dekat Bayreuth dan mendirikan kota Kulmbach.