Athens. Greece. View of the Gate of Athena Archegetis, the monumental formal entrance to the ancient Roman Agora or Forum. Built in 11 BC, it consists of a Doric portico with four prostyles columns supporting a pediment of Pentelic marble. Dating from the 1st century BC, the Roman Agora is about 100 metres to the east of the Ancient Agora and is complex consisting of a large rectangular open courtyard surrounded by stoas, shops and storerooms.