ade , ▁and ▁the ▁device ▁he ▁chose ▁for ▁himself ▁was ▁ 3 ▁white ▁ros es ▁on ▁a ▁field ▁of ▁blue , ▁today ▁P li en ingen ' s ▁Co at ▁of ▁Ar ms . ▁Starting ▁in ▁the ▁ 1 2 th ▁and ▁ 1 3 th ▁Century , ▁House ▁P li en ingen ▁ruled ▁P li en ingen ▁from ▁Burg ▁P li en ingen . ▁The ▁oldest ▁commercial ▁operation ▁of ▁the ▁P li ening ens ▁is ▁the ▁Upper ▁Se em ühle , ▁which ▁dates ▁back ▁to ▁the ▁ 1 2 th ▁century ▁in ▁the ▁Kör sch tal ▁( ). ▁ ▁In ▁ 1 7 4 7 , ▁the ▁Old ▁Town ▁Hall ▁at ▁M ön ch hof ▁was ▁constructed . ▁Later , ▁in ▁ 1 7 7 0 , ▁Duke ▁Charles ▁Eug ene ▁of ▁Wür ttemberg ▁constructed ▁Schloss ▁H ohen heim ▁from ▁an ▁old ▁mo ated ▁castle . ▁On ▁April ▁ 1 , ▁ 1 9 4 2 , ▁P li en ingen ▁and ▁B irk ach ▁were ▁accepted ▁into ▁Stuttgart ▁as ▁districts ▁and ▁neighborhood s . ▁ ▁When ▁the ▁districts ▁of ▁Stuttgart ▁were ▁divided ▁in ▁ 1 9 5 6 , ▁P li en ingen ▁was ▁divided ▁into ▁three ▁bor ough s : ▁P li en ingen , ▁H ohen heim , ▁and ▁Ste ck feld . ▁In ▁ 2 0 0 1 , ▁all ▁five ▁bor ough s ▁of ▁P li en ingen ▁were ▁established . ▁ ▁Att ra ctions ▁▁ ▁Schloss ▁H ohen heim ▁– ▁Old ▁residence ▁of ▁Duke ▁Charles ▁Eug