A lūstrum was a term for a five-year period in Ancient Rome.
Census frieze from the so-called "Altar of Domitius Ahenobarbus", with the taking of the census (at left) and the procession of the suovetaurilia. The tall warrior standing at the altar is sometimes identified as the god Mars himself
The censor was a magistrate in ancient Rome who was responsible for maintaining the census, supervising public morality, and overseeing certain aspects of the government's finances.
Lustrum
…figuratively, a den of vice), plural lustra ( LUUS-trah). The lustration was originally a sacrifice for expiation and purification offered by one of the censors in the name of the Roman people at the close of the taking of the census. The sacrifice was often in the form of an animal sacrifice, known as a…
Scene of census-taking from the so-called Altar of Domitius Ahenobarbus, late 2nd century BC
The Temple of Saturn, which housed the aerarium Saturni and the aerarium sanctum
Appius Claudius Caecus, one of the most influential censors