A particular kind of edifice, of great magnificence, consisting of seven stories of
columns, one above the other, supporting seven distinct entablatures or zones, from which it
received the name. Two such structures are specially recorded in the city of
Rome—one in the Twelfth Region, which existed before the time of the emperor Titus
(Suet. Tit. 2
xv. 6, 3
); and the other in the Tenth Region, under the Palatine Hill, and near the
Circus Maximus, which was built by Septimius Severus (Spart. Sev.
stories of this last structure remained standing during the pontificate of Sixtus V., but were
taken down by him for the purpose of employing the columns in building the Vatican. See
Middleton, Remains of Ancient Rome
, i. 218; 219 (note).