A Pope, an Aqueduct & a Holy Year

Via del Nazareno

Pope Sixtus IV & the Acqua Vergine

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Why should a small, plain wooden door in Via del Nazareno be surmounted by a papal coat of arms?

The pope in question is Sixtus IV (r. 1471-84), and behind the door lies part of the channel of an ancient Roman aqueduct, the Aqua Virgo, which he had repaired for the Holy Year of 1475. Three (mostly buried) arches of the aqueduct can be seen on the other side of the narrow street. 

The Aqua Virgo was commissioned by Marcus Agrippa, general and son-in-law of the emperor Augustus, and completed in 19 BCE. The aqueduct was 13 miles long and mainly supplied water to a set of public baths that Agrippa had built near the Pantheon. 

The Aqua Virgo, now the Acqua Vergine Antica, still provides some of Rome's water, including the water which flows into the Trevi Fountain. 

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Three Surviving arches of the Aqua Virgo