Doric columns are classical Greek architectural supports typically built of stone. On the Greek mainland they were often carved from marble; in western Greek colonies in southern Italy and Sicily, where fine white marble was scarce, builders more often used painted or stuccoed limestone.
The Doric order, invented in the second half of the 7th century BCE (possibly in Corinth), translated earlier wood-and-brick structural forms into stone: simple baseless shafts with spreading capitals and a triglyph-metope frieze. Early Doric temples were not always all stone—examples such as the temple at Thermum still combined timber and fired clay with stone.
Source: Encyclopaedia Britannica – Western architecture: Ancient Greek