Forma Urbis Romae
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The Forma Urbis Romae or Severan Marble Plan is a massive marble map of ancient Rome, created under the emperor Septimius Severus between 203 and 211. Scholar Matteo Cadario gives specific years of 205-208, noting that the map was based on property records.
It originally measured 18 m (60 ft) wide by 13 m (45 ft) high and was carved into 150 marble slabs mounted on an interior wall of the Temple of Peace.
Created at a scale of approximately 1 to 240 (Cadario states 1:260 to 1:270), the map was detailed enough to show the floor plans of nearly every temple, bath, and insula in the central Roman city. The boundaries of the plan were decided based on the available space on the marble, instead of by geographical or political borders as modern maps usually are.
The map was oriented with south at the top. On the map are names and plans of public buildings, streets, and private homes. The creators used signs and details like columns and staircases.
The Plan was gradually destroyed during the Middle Ages, with the marble stones being used as building materials or for making lime. In 1562, the young antiquarian sculptor Giovanni Antonio Dosio excavated fragments of the Forma Urbis from a site near the Church of SS. Cosma e Damiano, under the direction of the humanist condottiere Torquato Conti, who had purchased excavation rights from the canons of the church. Conti made a gift of the recovered fragments to Cardinal Alessandro Farnese, who entrusted them to his librarian Onofrio Panvinio and his antiquarian Fulvio Orsini. Little interest seems to have been elicited by the marble shards.
In all about 10% of the original surface area of the plan has since been recovered, in the form of over one thousand marble fragments, which are kept in the Palazzo dei Conservatori of the Capitoline Museums.
Piecing together the surviving fragments of the plan is an activity that has engrossed scholars for centuries. Renaissance scholars managed to match and identify around 250 of the pieces, usually by recognizing famous landmarks such as the Colosseum and the Circus Maximus. In the second half of the 20th century, thanks to the works and publications of Guglielmo Gatti, Lucos Cozza, and Emilio Rodríguez Almeida, several fragments of the plan have been identified and located. Other scholars (e.g. Claudia Cecamore, Filippo Coarelli, Daniele Manacorda, Domenico Palombi, Luigi Pedroni, David West Reynolds, and others) have re-interpreted the topography depicted on many fragments. A research project at Stanford University in 2002 had some success in positioning four fragments and in reassembling nine fragments with pattern recognition algorithms. Using archaeological and literary sources, since 1996 Pier Luigi Tucci (Johns Hopkins University) has positioned twenty-four fragments in five Augustan regions and has offered new interpretations of the area of the AQVEDVCTIVM on the Caelian hill, of the Republican building in opus incertum at Testaccio (with Lucos Cozza), and of the area of the circus Flaminius (in particular, the ship of Aeneas and the earlier marble plan from the Via Anicia).
A new piece of Forma Urbis Romae that completes the words 'Circus Flaminius' has been uncovered in 2014 at the Palazzo Maffei Marescotti, a building owned by the Vatican. 
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- new piece of Forma Urbis Romae
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- Meneghini, Roberto; Santangeli Valenzani, Riccardo (eds), Formae Urbis Romae. Nuovi frammenti di piante marmoree dallo scavo dei Fori Imperiali (Bullettino della Commissione Archeologica Comunale di Roma, Suppl. 15) (Rome, 2006) 99-101 (bibliography on the Forma Urbis between 1960 and 2006)
- Tucci, Pier Luigi, ‘New fragments of ancient plans of Rome’, Journal of Roman Archaeology 20 (2007) 469-80 (a review of Meneghini - Santangeli Valenzani 2006)
- Tucci, Pier Luigi, ‘Dov’erano il tempio di Nettuno e la nave di Enea?’, Bullettino della Commissione Archeologica Comunale di Roma 98 (1997) 15-42; Tucci, Pier Luigi, ‘Ideology and technology in Rome’s water supply: castella, the toponym AQVEDVCTIVM, and supply to the Palatine and Caelian hill’, Journal of Roman Archaeology 19 (2006) 94-120; Tucci, Pier Luigi (with Lucos Cozza), ‘Navalia’, Archeologia Classica 57 (2006) 175-202; Tucci, Pier Luigi, ‘Imagining the temple of Castor and Pollux in circo Flaminio’, in A. Leone, D. Palombi, S. Walker (eds), Res Bene Gestae. Ricerche di storia urbana su Roma antica in onore di Eva Margareta Steinby (Rome 2007) 411-425; Tucci, Pier Luigi,‘La controversa storia della Porticus Aemilia’, in Archeologia Classica 63 (2012) 575-591; Tucci, Pier Luigi,‘The Pons Sublicius: a reinvestigation’, in Memoirs of the American Academy in Rome 56-57 (2011-2012) 177-212. Tucci's visual analysis of the Forma Urbis, as well as his research on the role of this marble plan in the Templum Pacis, will be published in 2014 (personal communication).