|Location||IV Templum Pacis|
|Type of structure||Basilica|
The building was erected under Trajan, with the purpose of adapting the slopes of the Capitoline Hill after the removal of the gap between it and the Quirinal Hill. It was higher than the level of the square and the access was through two staircases on the south-west end of the portico. The portico had two rows of pillars made of tuff stones and its naves were covered with barrel vaults, partially preserved. As the basilica rose in an obligated space, it has an irregular drawing, turning round the temple and probably continuing out of the present archeological area, close to the south-west exedra of the Trajan's Forum.
The plaster covering the back wall of the building, still preserved, displays several graffiti, some of which quote lines of the 'Aeneid: this detail makes possible that the basilica housed a school, mentioned by late sources about the Trajan's Forum and the Forum of Augustus.