Browsing named entities in a specific section of Samuel Ball Platner, Thomas Ashby, A Topographical Dictionary of Ancient Rome. Search the whole document.
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CRYPTA BALBI mentioned only in the Notitia (Reg. 1), but probably built by Balbus in 15 B.C. at the same time as his theatre (q.v.). The name is best explained as a term used for a vaulted passage lighted from above (RE iv. 1732), and this building may have been a sort of ambulatory round the cavea of the theatre. No traces of it have been found, and the remains in the Via dei Calderari, formerly identified as the Crypta Balbi, belong to another structure (cf. PORTICUS MINUCIA; HJ 521, 545; Jord. ii. 534; Gilb. iii. 329).