<p>The monumental basilica along the S side of the *Forum, between the *Vicus Iugarius and *Vicus Tuscus, begun by Caesar <i>c</i>. 54 B.C. (cf. Cic., <i>Att</i>. 4.16.8) to replace the Basilica Sempronia of 169 B.C. (Giuliani and Verduchi) was dedicated unfinished in 46 B.C. (Jer., <i>Ab Abr</i>. 1971) and later completed by Augustus (<i>RG</i> 20.3). This basilica burned (12 B.C.?) and was rebuilt by Augustus in the names of his adopted sons Gaius and Lucius in A.D. 12 (<i>RG</i> 20.3; Suet., <i>Aug</i>. 29.4); later references show that the name <i>basilica Gai et Luci</i> did not achieve currency (cf. Suet., <i>Cal.</i> 37.1; Quint., <i>Inst.</i> 12.5.6). This rebuilding probably engulfed the <i>lacus Servilius</i> (La Regina), a monumental fountain which Festus located (in the past tense) ‘at the beginning of the Vicus Iugarius, adjacent to the Basilica Iulia’ (370: <i>in principio vici Iugari, continens basilicae Iuliae</i>).</p><p>Only the pavement and the foundations of the basilica’s pillars have survived, but the broad dimensions of the structure are clear (<i>LTUR</i> I, fig. 93). Restorations to the Basilica Iulia by Diocletian (<i>Chron</i>. 148) and by the urban prefect Gabinius Vettius Probianus in either A.D. 377 or 416 (<i>CIL</i> VI 1156b, 1658, 31884-86) do not appear to have altered the dimensions of the Augustan Basilica Iulia, part of which is represented on the Severan Marble Plan (Carettoni <i>et al.</i>, <i>Pianta</i> pl. 21; Rodríguez Almeida, <i>Forma</i> pl. 13, frags. 18 b,c,d).</p><p><i>Addendum</i></p><p>On the problematic date A.D. 12 for Augustus’ dedication of the Basilica Iulia and its unacceptable identification with a <i>stoa Iulia</i>, created by an emendation of Dio Cass. (56.27.5): <i>Urbem</i> 217 with n.278; 215 n.276.</p><p></p><embed alt="Basilica Iulia_AutoCAD.png" embedtype="image" format="fullwidth" id="347"/><p></p>