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In page Boii:

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However, the Boii had not been exterminated: There was a civitas Boiorum et Azaliorum (the Azalii being a neighbouring tribe) which was under the jurisdiction of a prefect of the Danube shore (praefectus ripae Danuvii).[2] This civitas, a common Roman administrative term designating both a city and the tribal district around it, was later adjoined to the city of Carnuntum.[citation needed]