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The Parthenon was of the Doric order of architecture, and was of the form termed peripteral octastyle; that is to say, it was surrounded by a colonnade, which had eight columns at each end.

In other words Agrippa’s portico was decastyle; the actual portico is octastyle.

It was peripteral, octastyle; that is, surrounded with a portico of columns, with eight to each façade.

These rules for symmetry were established by Hermogenes, who was also the first to devise the principle of the pseudodipteral octastyle.

If an octastyle is to be constructed, let the front be divided into twenty-four parts and a half.