<p>The home of the prominent Augustan consular and longtime friend of Tiberius, described by Tacitus as ‘overhanging the Forum’ (<i>foro imminens</i>: <i>Ann.</i> 3.9.3). A recently-published inscription from Spain refers to certain structures ‘which Piso built over the *Porta Fontinalis in order to join private houses’ (SVPRA PORTAM FONTINALEM, QVAE INAEDIFICASSET IVNGENDARVM DOMVM PRIVATARVM CAVSA: Eck <i>et al</i>., ll. 106-7), which were demolished by the decree of the Senate in A.D. 20 in the wake of Piso’s disgrace following the death of Germanicus. This location fits well with Tacitus’ wording, since the pre-Trajanic geography of the area between the *Quirinal (s.v.) and the *Arx, where the Porta Fontinalis stood, was high enough in relation to the neighboring *Forum to provide the visual prominence that a powerful Senator’s residence required.</p> <p>It is unclear how we should reconstruct this structure’s ground-plan from its description. The inscription cited above refers specifically to additions built by Piso to merge more than one separate <i>domus</i> into a single complex (cf. *Palatium for this 1st-c. B.C. tendency). The language used seems to suggest something built over, i.e. on top of, the gate itself, perhaps connecting houses on either side of the city wall (Bodel 59). Alternatively, the preposition ‘<i>supra</i>’ may simply refer to the general location of the structures in question, and need not suggest that Piso’s domicile actually impinged upon a public structure (Flower 169-70). In either case, no remains have yet been found. The site of the house’s general location is shown on our map just inside the gate.</p>