BASILICA NEPTUNI
a building restored by Hadrian (Hist. Aug. 19), and mentioned in Cur. in Region IX and in Pol. Silv. (545). This basilica is now generally, and properly, identified with the στόα Ποσειδῶνος built by Agrippa in 25 B.C. (Cass. Dio liii. 27), and with the Ποσειδω᾽νιον that was burned in the great fire in the reign of Titus (ib. lxvi. 24) and stood between the Pantheon and the Hadrianeum. By some it has also been identified with the PORTICUS ARGONAUTARUM (q.v.), but it is probable that they were separate structures, although near together and possibly adjoining (Lucas, Zur Geschichte der Neptunsbasilika, Berlin 1904; OJ 1912, 132-135).