The Porticus Catuli (Latin for the "Portico of Catulus") was a portico on the Palatine Hill in ancient Rome. It was a local landmark ().T.P. Wiseman, "Monuments and the Roman Annalists," in Past Perspectives: Studies in Greek and Roman Historical Writing (Cambridge University Press, 1986), p. 97. It was built by Quintus Lutatius Catulus (consul 102 BC) to commemorate his joint victory with Gaius Marius over the Cimbri at Vercellae.

The portico was adjacent to Catulus's house (), which Pliny the Elder regarded as one of the grandest built in the late 2nd century BC.Pliny the Elder, Natural History 17.2; Lawrence Richardson, A New Topographical Dictionary of Ancient Rome (Johns Hopkins University Press, 1992), p. 123. The practice of expanding a family's home from the relatively modest structures of the mid-Republic began at this time.Katherine E. Welch, "Domi militaeque: Roman Domestic Aesthetics and War Booty in the Republic," in Representations of War in Ancient Rome (Cambridge University Press, 2006), p. 122. The Porticus Catuli became known for the display of artwork there.Kim J. Hartwick, The Gardens of Sallust: A Changing Landscape (University of Texas Press, 2004), p. 17. Its impressiveness rivaled that of the Temple of Honor and Virtue built by Marius also to commemorate the victory, for which both men earned a triumph.Robert Morstein-Marx, Mass Oratory and Political Power in the Late Roman Republic (Cambridge University Press, 2004), p. 106.

The Porticus Catuli was located on a prominent piece of real estate that had already been highly politicized. It had formerly been the site of the house of M. Fulvius Flaccus, one of the supporters of the popularist Gaius Gracchus who were condemned to death and had their property confiscated and destroyed.Stephen L. Dyson, Rome: A Living Portrait of an Ancient City (Johns Hopkins University Press, 2010), p. 75. In the mid-1st century BC, the Porticus Catuli was involved in the feud between Cicero and Clodius. When Cicero was condemned to exile for putting Roman citizens to death without allowing them right of appeal, Clodius razed Cicero's house and perhaps also the Porticus Catuli to build a shrine (aedes) to Libertas. If the portico was razed rather than incorporated into the new religious complex, it was rebuilt along with Cicero's house when the orator was restored to Rome.W. Jeffrey Tatum, The Patrician Tribune: Publius Clodius Pulcher (University of North Carolina Press, 1999), pp. 162–163, 193.

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