<p>A prominent Republican warehouse complex in the *Emporium area, not far from the *Tiber, known only from epigraphic evidence (e.g., <i>CIL</i> VI 9471: CONDVCTOR HORREORVM SEIANORVM; Palombi). Based on the findspots of a number of inscriptions which were excavated <i>in situ</i>, Lanciani located the <i>horrea</i> just SE of the so-called *Porticus Aemilia (Lanciani, <i>FUR</i> pl. 40; Rodríguez Almeida; <i>CIL</i> VI 238, 9471, 36778, 36786, 36819). Based on the name of the monument, the foundation of the <i>horrea</i> is associated with the Seii family-clan, and specifically with M. Seius, who was an aedile in 74 B.C. (Étienne; Rickman; Palombi 47). During building construction in 1911 between Via G. Branca, Via G. Battista Bodoni and Via Beniamino Franklin, remains of possible warehouse structures showing extensive use of <i>opus reticulatum</i> were uncovered (Blake; Palombi, for complete references). Even if the Horrea Seiana can be associated with these scanty remains, no coherent plan can be deduced without further systematic excavations in the area.</p>