The educational and cultural use of the exedrae were recorded in the late antiquity. With the dedication of the Forum of Trajan in 112, the number of inscriptions found in the Forum of Augustus decline, which suggests that many of its functions were transferred to the new venue, although Hadrian made some repairs. In 19 AD Tiberius added two triumphal arches either side of the temple in honour of Drusus the Younger and Germanicus and their victories in Germania. The incomplete forum and its temple were inaugurated, 40 years after they were first vowed, in 2 BC. These land issues, as well as numerous architectural mishaps, prolonged construction.
Suetonius states that Augustus did not want to take the houses of the nearby owners by force. Instead, the plans were altered slightly, so some asymmetry is apparent, especially in the Eastern corner of the precinct. However, the initial plans called for more space than he had and would have required him to purchase or expropriate further land. The majority of the land that the Forum was to be built on was already owned by Augustus himself. Augustus used social propaganda by continuing Julius Caesar's will to create a Temple to Mars Ultor "greater than any in existence," by placing it within the Temple, linking himself to his divine adopted father, obtaining a strong link to the Roman population through their love for the deceased dictator. He became the Princeps of Rome in 27 BC under the name Augustus, and planned for the temple to be built in a new forum named after himself.
After winning the battle, with the help of Mark Antony and Lepidus, Octavian had avenged the assassination of his adoptive father Julius Caesar. The triumvir Octavian vowed to build a temple honoring Mars, the Roman God of War, during the battle of Philippi in 42 BC. The fireproof wall with Arco dei Pantani and the columns of the temple.