Portico

A portico is a porch leading to the entrance of a building, or extended as a colonnade, with a roof structure over a walkway, supported by columns or enclosed by walls.

[2] The tetrastyle has four columns; it was commonly employed by the Greeks and the Etruscans for small structures such as public buildings and amphiprostyles.

Roman taste favoured narrow pseudoperipteral and amphiprostyle buildings with tall columns, raised on podiums for the added pomp and grandeur conferred by considerable height.

The best-known octastyle buildings surviving from antiquity are the Parthenon in Athens, built during the Age of Pericles (450–430 BCE), and the Pantheon in Rome (125 CE).

The destroyed Temple of Divus Augustus in Rome, the centre of the Augustan cult, is shown on Roman coins of the 2nd century CE as having been built in octastyle.

The portico of the Croome Court in Croome D'Abitot (England)
Temple diagram with location of the pronaos highlighted
Temple of Portunus in Rome, with its tetrastyle portico of four Ionic columns
The hexastyle Temple of Concord at Agrigentum ( c. 430 BCE)
The western side of the octastyle Parthenon in Athens