House Harkonnen was a Great House during the time of the Padishah Emperors. Their capital was Giedi Prime, a heavily industrialised planet with a low photosynthetic potential. House Harkonnen was most famous for its underhanded and sinister political tactics, and for an ancient feud it maintained with another Great House, House Atreides. In addition, House Harkonnen had a reputation for ambition, malevolence, hatred and brutality. It was typically ruled by a Siridar Baron.