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He accepted of the tribunitian power for life, but more than once chose a colleague in that office for two lustra The Lustrum was a period of five years, at the end of which the census of the people was taken. It was first made by the Roman kings, then by the consuls, but after the year 310 from the building of the city, by the censors, who were magistrates created for that purpose. It appears, however, that the census was not always held at stated periods, and sometimes long intervals intervened. successively. He also had the supervision of morality and observance of the laws, for life, but without the title of censor; yet he thrice took a census of the people, the first and third time with a colleague, but the second by himself.