Constitutio Antoniana Undoubted the only historically memorable act of the emperor Caracalla is the edict by which he gave citizenship to all the freeborn inhabitants of the Empire in A.D. 212.

• 公民权的贬值和态度的转变塔西陀曾就帝国时代和共和时代对授予公民权两种心态做了不甚赞同的态度：共和时代授予公民权很少，仅仅是为了奖励(人们的)勇敢。