Diocese of Hispania

The Diocese of Hispania was a late antique administrative unit (Dioecesis) of the Roman Empire on the Iberian Peninsula. It existed from 298 to about 409 AD. Its capital was Augusta Emerita. The diocese was governed by a vicarius responsible to the praetorian prefect of Gaul.

Organization
The Diocese of Hispania originally comprised the following six provinces: The Balearic Islands were detached from Tarraconensis in the 4th century as the independent province of Hispania Balearica, becoming the seventh province within the Diocese of Hispania.
 * Hispania Baetica
 * Lusitania
 * Hispania Carthaginensis
 * Gallaecia
 * Hispania Tarraconensis
 * Mauretania Tingitana (in North Africa)

History
The Roman Empire was initially divided into 46 provinces, which were subdivided by Diocletian around 300 AD into 101 provinces, which in turn were grouped into 12 dioceses. At the division of the Empire in 395, the structure was changed into four prefectures, 15 dioceses and 119 provinces. With the conquest of Hispania by the Vandals, Alans, and Suebi in 409, the diocese began to collapse.