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The grand temples of Greece were built either of stone or of marble. As a general rule they are set on a platform to which a long flight of steps lead up, and are enclosed within an outer wall or a continuous colonnade. Their plan is extremely simple: a parallelogram, formed in some cases entirely of columns, in others with walls at the side and columns at the ends only, encloses a second and considerably smaller pillared space known as the cella or naos, that enshrined the image of the god to whom the building was dedicated, and was entered from a pronaos or porch, and with a posticum or back space behind it, sometimes supplemented by a kind of second cella called the opisthodomus or back temple. The front columns at either end are spanned by horizontal beams that uphold a sloping gable called a pediment, the flat, three-cornered surface of which is generally adorned with sculpture in bas-relief, and along the side-columns is placed what is known as the entablature, that consists of three parts, the architrave resting on the capitals of the columns, the frieze above it and the cornice, the last of which sustains the flat roof, usually covered with tiles or marble copies of tiles. Greek architecture is generally divided into three groups or orders: the Doric, Ionic, and Corinthian, each of which, though the buildings belonging to them resemble each other in general plan, is distinguished by certain peculiarities of the columns and entablatures. The Doric was the earliest to be employed, but the Ionic, that early succeeded it, was long used simultaneously with it, sometimes even in the same building, whilst the Corinthian did not come into use until considerably later.
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