See Cod. Theodos. 1. xiii. and xiv. and Cod. Justinian. Edict. xii. tom, ii. p. 648, edit Genev. See the beautiful complaint of Rome in the poem of Claudian de Bell. Gildonico, ver 60-62:-
Cum subiit par Roma mihi, divisaque sumsit
Aequales Aurora togas; Aegyptia rura
In partem cessere novam.