This article may lack focus or may be about more than one topic. In particular, is this article about the word, the concept, or should it be a disambig page?.(October 2010)
A pentapolis (from Greek - penta-, 'five' and polis, 'city') is a geographic and/or institutional grouping of five cities. Cities in the ancient world probably formed such groups for political, commercial and military reasons, as happened later with the Cinque Ports in England.