A gate that roughly corresponds to modern Porta Sempione was already part of Roman walls of Milan. It was called "Porta Giovia" ("Jupiter's Gate") and was located at the end of modern Via San Giovanni sul Muro. At the time, the gate was meant to control an important road leading to what is now Castelseprio. Very little remains of the original Roman structure; some Roman tombstones that used to be placed by the outer side of the walls have been employed in the construction of later buildings such as the Basilica of Saint Simplician
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