Seven Fortresses or Cities means Sibenburgen, Sette Fortrezze or Seven Fortresses German name of Transylvania that is symbolized by the seven burgs/fortresses/cities vary  famous: Sebes (Mühlbach), Sibiu (Hermannstadt), Medias (Medias), Sighisoara (Schassburg), Brasov (Kronstadt), Bistrita (Bistritz) and Orastie (Broos, Brosz) -  Siebenbürgen, meaning "seven fortresses" certified for first date time on 14 July 1349.

  Pianu Lower (Pianu de Jos) or in the Saxon dialect Deutschpien, German Deutsch-Piano in Hungarian Alsópián, Szászpián, as occurs in Iosefina map of Transylvania, 1769-1773) is mentioned in documents for the first time in 1488 with the name Blechis pen (Pian Olah 1733), and homonymous valley is known by the gold wash since 1435.

         In the early centuries. specially in the nineteenth-century is working on this valley over 600 gold washing persons, each of one  can deliver between 300 and 400 grams of gold, enjoying some privilleges.At  Strungari (nearest village) worked a paper mill between 1774 and 1778, mill belonging to Sebes city.

           Lower Pianu (Pianu de Jos) belonged until 1876 to "seat Sebes" administrative unit component of the body's self Transylvanian Saxons, called "Seven Chairs" and was incorporated in 1486 in "Saxon University.