We are told by Vitruvius that the Temple at Eleusis consisted at first of one cell of vast magnitude, without columns, though it was probable that it was meant to be surrounded in the customary manner; a prostyle, however, only was added, and that not until the time of Demetrius Phalereus, some ages after the original structure was erected.
"The Eleusinian Mysteries and Rites"
Dudley Wright