Tullianum, the underground execution cell of the *prison at Rome, flanking the *Comitium, and traditionally associated with Servius *Tullius (Varro, Ling. 5. 151; Festus 356). The derivation from tullus, a spring, is more attractive, for a spring still rises in the present floor, higher than the original. The existing chamber, once circular (diam. c. 7 m.), is built in peperino ashlar not earlier than the 4th cent.
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