The Parthenon, the finest monument on the Acropolis in terms of both conception and execution, is the most magnificent creation of Athenian democracy at the height of its power. It was built between 447 and 438 BC, as part of the greater Periklean building project, this so-called Periklean Parthenon. It was designed by architects Iktinos and Kallikrates, while the sculptor Pheidias supervised the entire building program and conceived the temple’s sculptural decoration and chryselephantine statue of Athena. The Parthenon is a double peripteral Doric temple with several unique and innovative architectural features. The temple is divided into pronaos, cella and opisthodomos, with a separate room at the west end, and is surrounded by a pteron with eight columns on each of the short sides and seventeen columns on the long ones. The interior demonstrates an innovative approach to both new and old elements: inside the cella a double pi-shaped colonnade established a background for the gold and ivory statue of Athena Parthenos, which showed the goddess in full armour carrying Nike (Victory) to the Athenians in her right hand.