The oldest known example of a Corinthian column is in the Temple of Apollo Epicurius at Bassae in Arcadia, c. 450-420 BC. It is not part of the order of the temple itself, which has a Doric colonnade surrounding the temple and an Ionic order within the cella enclosure. A single Corinthian column stands free, centered within the cella. This is a mysterious feature, and archaeologists debate what this shows: some state that it is simply an example of a votive column. A few examples of Corinthian columns in Greece during the next century are all used inside temples. A more famous example, and the first documented use of the Corinthian order on the exterior of a structure, is the circular Choragic Monument of Lysicrates in Athens, erected c. 334 BC.