House of Karen (Middle Persian: Kārēn, Parthian: 𐭊𐭓𐭍𐭉 Kārēn, Persian: کارن‎ Kārin or Kāren, also known as Karen-Pahlav (Kārēn-Pahlaw) was one of the Seven Great Houses of Iran during the rule of Parthian and Sassanian Empires. The seat of the dynasty was at Nahavand, about 65 km south of Ecbatana (present-day Hamadan, Iran). Members of House of Karen were of notable rank in the administrative structure of the Sassanian empire in multiple periods of its four century-long history.