diameter and were very closely spaced with an intercolumniation of a single column width. The individual members of its Doric orders all differ considerably from the later canon, although all essential Doric features are present. Its ground plan of 8 by 17 columns, probably pseudoperipteral, is unusual. Archaic Olympieion, Athens Among the Doric temples, the Peisistratid Olympieion at Athens has a special position. Although this building was never completed, its architect apparently attempted to adapt the Ionic . Column drums built into the later foundations indicate that it was originally planned as a Doric temple. Nonetheless, its ground plan follows the Ionic examples of Samos so closely that it would be hard to reconcile such a solution with a Doric triglyph frieze. After the expulsion of Hippias in 510 BCE, work on this structure was stopped: Democratic Athens had no desire to continue a monument of tyrannical self-aggrandisation. Classical period: canonisation Apart from this exception and some examples in the more experimental poleis of Greater Greece, the Classical Doric temple type remained the . Its perfection was a priority of artistic endeavour throughout the Classical period. Temple of Zeus, Olympia (460 BCE) The canonical solution was found fairly soon by the architect Libon of Elis, who erected the Temple of Zeus at Olympia around 460 BCE. With its 6 × 13 columns or 5 × 12 intercolumniations, this temple was designed entirely rationally. Its column bays (axis to axis) measured , a triglyph + metope , a plus the adjacent space () , the tile width of the marble roof was . Its columns are powerful, with only a slight ; the echinus of the capitals is already nearly linear at 45°. All of the superstructure is affected by curvature. The measures exactly 3 × 9 column distances (axis to axis), its external wall faces are aligned with the axes of the adjacent columns. Other canonical Classical temples The Classical proportion, 6 × 13 columns, is taken up by numerous temples, e.g. the Temple of Apollo on Delos (), the Temple of Hephaistos at Athens and the temple of Poseidon on Cape Sounion. A slight variation, with 6 × 12 columns or 5 × 11 intercolumniations occurs as frequently. The Parthenon (450 BCE) The Parthenon maintains the same proportion at a larger scale of 8 × 17 columns, but follows the same principles. In spite of the eight columns on