Esp., the Roman State-prison ; extended under ground by Servius Tullius; hence this part of the prison is called Tullianum.

http://lila-erc.eu/data/lexicalResources/LewisShort/id/LexicalSense/n6752.3 an entity of type: LexicalSense

Esp., the Roman State-prison ; extended under ground by Servius Tullius; hence this part of the prison is called Tullianum. 
Esp., the Roman State-prison ; extended under ground by Servius Tullius; hence this part of the prison is called Tullianum. 

data from the linked data cloud