Illustrated Companion to the Latin Dictionary/Robur

This article incorporates text from a publication now in the public domain: Rich, Anthony (1849). The illustrated companion to the Latin dictionary, and Greek lexicon. p. vi. OCLC 894670115. https://archive.org/details/illustratedcompa00rich. 

RO'BUR. The underground dungeon in a gaol (carcer) in which the sentence of capital punishment was carried into execution; whence the expression, dignum carcere et robore (Apul. Apol. p. 530.), deserving imprisonment and death. Festus, s. v. Liv. xxxviii. 59. compared with xxxiv. 44. where it is termed carcer inferior. Lucan. ii. 125. It is shown by the circular chamber in the annexed illustration (Robur/1.1), which represents a section of the state prisons, constructed by Ancus Martius and Servius Tullius, now existing at Rome, and the identical one to which the passages of Livy, above quoted, refer.

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  Robur/1.1