There is still an argument whether the name "Tiberia Platea" (Tiberius square) should be given to the whole street complex or only to the 30 m wide square in front of the Propylon. The architectural plan of the shops behind the porticos on both sides of the large street-square and the connection between square and street are evidence that the whole complex up to the Propylon can be named as the Tiberia Platea.
The square, which starts from Cardo Maximus Street and extends to the east in a rectangular shape with a width of 30 m and a maximum length of 90 m is called Tiberia Platea because it was arranged by the Roman Emperor Tiberius. This forum serves as a front square that provides access to the temple, and it is where the heart of the city beats. A round temple of fertility goddess was preserved in the forum at the basic level. There should be restaurants, entertainment venues and shops in the north and south of the square. Some of the excavated places can be seen. A fountain was built in the Forum in the Late Period. The water pipes that bring water to the fountain are seen on the ground. There were 12 steps in the east of the Forum, and there was a three-entry, arched monumental gate (propylon) that provided access to the sanctuary.
The 12 steps at the end of the Tiberia Platea are all that remain of the Propylon, a monumental passage gateway leading up to the Imperial Sanctuary. It was triple-arched and highly ornamented with its massive entablature carried by four columns in front and four at the rear. The building was an exemplar not only for the later Western City Gate but also for many other victory arches in Anatolia. The Propylon was built to honour Augustus who, as Octavian, had won the sea-battle of Actium against Marcus Antonius in 31 BC and thus became the single power of the Roman world. The aim of the decoration of the building is to commemorate the naval and other victories of Augustus.