Le due fontane di piazza Farnese

The two basins were moved from piazza San Marco, where they had stood since 1466: Paul III took the first, and Cardinal Alessandro Farnese the second some forty years later. Their origin is usually given as the Terme di Caracalla, though it.wikipedia records that the question is not settled. Girolamo Rainaldi turned them into fountains in 1626, after Gregory XV granted the Farnese 40 once of Acqua Paola water by a document dated 1 September 1621. The southern fountain was restored in 1938–39, both in 1992–93, and the southern one again in 2007.