Antenora is a location in Persona 3 FES. It is the fourth door in the Abyss of Time. It resembles an old ruins for the first 10 floors. From floors eleven to twenty, Antenora has purple walls with giant gemstones set in, like the first floors of Cocytus. The last five floors have blue walls and metallic floors, like the final floors of Malebolge At the 25th floor, there is a door into Junpei Iori's past.
In Inferno, the first cantica of Dante's Divine Comedy, Cocytus is the ninth and lowest circle of Hell and is divided into four descending "rounds," or sections. Antenora is the second of those sections, named after Antenor, a character from the Iliad, who betrayed his country. This is the section were where traitors to one's country are frozen forever in the waters of the lake that is Cocytus.
On the 8th Floor of Antenora there are golden chests which contain each character's summer and winter outfits.
On the 15th Floor of Antenora there are golden chests which contain each character's joke weapon.