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* built ostensibly by Octavia, the sister of Augustus (Fest. 178; Ov. AA i. 69), but really by Augustus and dedicated in the name of Octavia (Suet. Aug. 29; Cass. Dio xlix. 43; Liv. Ep. 138) at some time after 27 B.C. (cf. Vitr. iii 2. 5), in place of the PORTICUS METELLI (q.v.; Veil. i. I ) around the temples of Jupiter Stator and Juno (Plin. NH xxxvi. 42). The statement of Cassius Dio that it was built after 33 B.C. from the spoils of the war in Dalmatia, is due to confusion with the porticus Octavia. It was burned in 80 A.D. (Cass. Dio lxvi. 24) and restored, probably by Domitian, and again after a second fire in 203 by Severus and Caracalla (CIL vi. 1034). It was adorned with foreign marble (Ov. AA i. 70), and contained many famous works of art (Plin. NH xxxiv. 31; xxxv. 114, 139; xxxvi. 15, 22, 24, 28, 34, 35; cf. Neapolis ii. 234 n.). Besides the TEMPLES (q.v.) there were within the enclosure a BIBLIOTHECA (q.v.) erected by Octavia in memory of the youthful Marcellus (Suet. de gramm. 21; Plut. Marc. 30), a curia Octaviae (Plin. NH xxxvi. 28), and a schola (ib. xxxv. 114) or scholae (ib. xxxvi. 22). Whether these were different parts of one building, or entirely different structures, is uncertain. It was probably in the curia that the senate is recorded as meeting (Cass. Dio lv. 8; Joseph. B. Iud. vii. 5. 4). The whole is referred to by Pliny as Octaviae opera (Plin. NH xxxiv. 31; xxxv. 139; xxxvi. 15).

This porticus is represented on the Marble Plan (frg. 33). It enclosed a rectangular area, 118 metres in width and somewhat more in length, and consisted of a colonnade formed by a double row of granite columns, twenty-eight in each row in front. The main axis ran from north-east to south-west, and the principal entrance was in the middle of the south- west side. This entrance, of which some ruins still exist (Bull. d. Inst. 1878, 209-219; BC 1887, 331; 1890, 66-67; Mitt. 1889, 264-265; NS 1912, 153), had the form of a double pronaos, projecting inward and outward. Across each front of this pronaos, between the side walls, were four Corinthian columns of white marble, supporting an entablature and triangular pediment. The entablature and pediment and two of the columns of the outer front still exist (the other two have been replaced by a brick arch, perhaps after the earthquake of A.D. 442), and of the inner front two columns and part of the third, with portions of entablature and pediment. The height of the columns of the pronaos is 8.60 metres. Some of the marble antefixae at the lower ends of the ridge tiles also exist. Parts of some of the columns of the south colonnade are also standing, and some of their capitals are built into the walls of neighbouring houses (HJ 541-544; D'Esp. Mon. ii. 131-133; Fr. i. 65, 66; ZA 225-231). For the entasis, see Mem. Am. Acad. iv. 122, 142.

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