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In page Roman censor:

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A census was sometimes taken in the provinces, even under the Republic.[1] The emperor sent into the provinces special officers called censitores to take the census;[2] but the duty was sometimes discharged by the Imperial legati.[3] The censitores were assisted by subordinate officers, called censuales, who made out the lists, etc.[4] In Rome, the census was still taken under the Empire, but the old ceremonies connected with it were no longer performed, and the ceremony of the lustratio was not performed after the time of Vespasian. The jurists Paulus and Ulpian each wrote works on the census in the imperial period; and several extracts from these works are given in a chapter in the Digest (50 15).[citation needed]