The Castle of Oblivion ( ), also known as the Prison of Oblivion or the Fortress of Oblivion, was a castle and political prison of the Sasanian Empire located in Khuzestan in southwestern Iran. According to the Buzandaran Patmutûiwnkû and Procopius' Persian War, the name referred to the fact that it was forbidden to mention the name of the castle or its prisoners. It may be identifiable with the fortress of Agabana mentioned by Ammianus Marcellinus as the place of Arshak II's imprisonment. According to Claudia Ciancaglini and Giusto Traina, the Armenian form is a borrowing from an unattested Middle Persian name which may be reconstructed as *. The form is a later reinterpretation or Armenianization of the original word, identifying it with the common word 'forgotten'. Ciancaglini argues that the original meaning of the name was not 'Castle of Oblivion'âÂÂa sense derived from the Armenian etymological reinterpretationâÂÂbut rather 'immortal, imperishable fortress' (from Middle Persian 'immortal').