<p>Portico built by Cn. Octavius near the *Theater of Pompey between 167 and 163 B.C., the remains of which are yet to be discovered. Augustus restored the structure, keeping the original name of the founder (<i>RG</i> 19: <i>porticum ad circum Flaminium, quam sum appellari passus ... Octaviam ... feci</i>; Festus 188: <i>quam combustam reficiendam curavit Caesar Augustus</i>), and placed there the <i>insignia</i> regained from the Dalmatians in 33 B.C. (App., <i>Ill</i>. 28). The Porticus Octavia is described as <i>ad circum Flaminium</i> (<i>RG</i> 19; Pliny, <i>NH</i> 34.13), <i>in Circo</i> (Vell. Pat. 2.1.2), and <i>theatro Pompeii proximam</i> (Festus, <i>loc. cit.</i>), which suggests a location on the *Via Tecta (1) between the *Theatrum Pompeium and *Porticus Philippi (Viscogliosi 140; Coarelli 1968, 309-16; id. 1997, 403, 501, 520). Supporting this location is the Severan Marble Plan, which may depict the Porticus Octavia on frag. 31 hh.; above the NW corner of the Porticus Philippi is part of a wall which, given its orientation, may represent the front of the Porticus Octavia (Viscogliosi 140).</p> <p>Coarelli proposes that the porticus was a three- or four-sided structure (1968, 309-16; id. 1997, 403, 501, 520), and has shown that the linear colonnade hypothesized by Wiseman and Zevi (1976) on the basis of the later introduction of the quadriporticus form to Rome does not stand scrutiny (1997, 524). Pliny (<i>loc</i>. <i>cit</i>.) describes the portico as <i>duplex</i>, ‘two-aisled’, with bronze capitals (<i>Corinthia</i>; on the term ‘<i>duplex</i>’: Vitr., <i>De arch</i>. 5.9.2; Coulton). Further, the recent discovery of the Temple of Neptune, which follows a N–S orientation, refutes an earlier proposal that the Porticus Octavia, which is aligned along Via Tecta, encircled this temple (once advocated by Coarelli 1968; id. 1997).</p>