After his death, his son, Valentinian Ii., an infant of four years of age, with his half-brother Gratian a lad of about seventeen, became the emperors of the West.
They made Milan their home; and the empire was nominally divided between them, Gratian taking the trans-Alpine provinces, whilst Italy, Illyricum in part, and Africa were to be under the rule of Valentinian, or rather of his mother, Justina.
Richter, Das westromische Reich unter den Kaisern Gratian, Valentinian II.
And Gratian as a quadrilateral hall with four huge granite columns (now removed) in the centre, it was converted into a church about the close of the 4th century, and restored by Bishop Nicetius about 550.
A rescript of Gratian in 378 empowered the bishop of Rome to judge bishops with the assistance of six or seven other bishops or, in the case of a metropolitan, of fifteen comprovincial bishops.
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