Doric order The Roman architect Vitruvius, following contemporary practice, outlined in his treatise the procedure for laying out constructions based on a module, which he took to be one half a column's diameter, taken at the base. An illustration of Andrea Palladio's Doric order, as it was laid out, with modules identified, by Isaac Ware, in "The Four Books of Palladio's Architecture" (London, 1738) is illustrated at Vitruvian module. According to Vitruvius the height of Doric columns is six or seven times the diameter at the base. This gives the Doric columns a shorter, thicker look than Ionic columns, which have 8:1
Doric Greek accepted that Doric originated in the mountains of Epirus in northwestern Greece, the original seat of the Dorians. It was expanded to all other regions during the Dorian invasion (c. 1150 BC) and the colonisations that followed. The presence of a Doric state (Doris) in central Greece, north of the Gulf of Corinth, led to the theory that Doric had originated in northwest Greece or maybe beyond in the Balkans. The dialect's distribution towards the north extends to the Megarian colony of Byzantium and the Corinthian colonies of Potidaea, Epidamnos, Apollonia and Ambracia; there, it further added words to what