Colonnade the Pantheon in Rome or the stoae of Ancient Greece. When the intercolumniation is alternately wide and narrow, a colonnade may be termed araeosystyle (Gr. αραιος, "widely spaced", and συστυλος, "with columns set close together"), as in the case of the western porch of St Paul's Cathedral and the east front of the Louvre by Perrault. Colonnades have been built since ancient times and interpretations of the classical model have continued through to modern times, and Neoclassical styles remained popular for centuries. At the British Museum, for example, porticos are continued along the front as a colonnade. The porch of
Great Colonnade at Palmyra was later added to the eastern colonnade between the Bel and Nebu temples. The middle colonnade, stretching from east to west, was constructed to connect the two earlier colonnades. Work on the central avenue began from the Monumental Arch, where it met the eastern colonnade, sometime in the early third-century CE. The section stretched until the Great Tetrapylon where it met the western colonnade in an oval plaza. The central colonnade also incorporated the portico of the baths. The central section of the Great Colonnade became the most important with several civic buildings clustered around it, including the caesareum, the