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  • The idea for this work came from close observation of the external surfaces, considering their entire height, of Porta Appia when restoration work was carried out for the 2000 Jubilee. This direct examination of the walls has been developed here in light of studies that have explored the history of the Aurelian Walls with different approaches using a vector graph on the east side of the West tower of the gate (internal and external) which is considered the most representative part of the construction work involved. An overview of the various interventions that have taken place over time to integrate and develop the original Aurelian structure is followed by some reflections on the technical characteristics of the different construction typologies which can be seen along the walls. These elements can prove to be, if combined with stratigraphic evidence which is still legible, a valid aid in the attempt to chronologically place the different wall pieces. The work then focuses on the leaning systems of the masonries in the different construction phases which can be found in some towers and concludes with a collection of summary sheets on the wall typologies of the facings identified in the Porta Appia structure and recurring in the Aurelian circuit. The work highlights: the residual features of Aurelian's first factory (foundations and stairwell); the attribution to Honorius of the circular towers and marble bases with extensions added by Valentinian III; the plausibility of dating to the 8th-9th century the repair work above the marble part of the bastion of the front part of the west tower which probably collapsed after an earthquake; the dating to between the mid-12th and mid-13th centuries of the construction of the reinforcement pillars inside the towers; the substantial intervention of Nicholas V especially in the top part of the tower stairwells.