Kunigunde of Eisenberg (also known as Kunne; c. 1245 – before 31 May 1286), was a German noblewoman and the second wife of Landgrave Albert II of Thuringia.
Beautiful and ambitious, she attracted the attention of the Landgrave and became his mistress, bearing him two illegitimate children: With her lover's knowledge, is said that Kunigunde attempted the murder of Landgravine Margaret so that she could usurp her position and honours.
After some poison attempts, Kunigunde finally managed to so frighten her mistress, that Margaret fled the court the night of 24 June 1270, fearing for her life.
During the ceremony, she concealed her son Apitz under her robe, as this was supposed to procure for natural children, the privileges of legitimacy.
The Thuringian nobility resisted this, which led to a long succession of military hostilities between father and sons.