The administration of the Roman Empire from the reign of Vespasian to that of Hadrian showed continuity despite the fact that the emperors belonged to different dynasties. The first of these was the Flavian dynasty, and it was based on hereditary succession, while the second formed a dynasty based on the adoption of a successor. Yet the pattern established by Vespasian was continued and developed by all these emperors, and this was particularly reflected in the appointment of consular legates. Consular legates governed provinces containing legions, and so their loyalty and trustworthiness were of considerable importance, as they had the means to stage a revolt against the emperor. Rebellion against the emperor did occur during the Civil Wars of 69AD and also during the reign of Domitian.
The consular legates of this period formed a "power set" within the Senate, and they maintained their élite status through intermarriage. So family relations were important, as they showed the exclusive nature of this "power set", and, by tracing the family history through succeeding generations, the influence of this group becomes apparent. Of course, not all the descendants of consular legates have been identified, but where this has been possible, it can be seen that they held prominent positions, at least reaching the consulship.
The choice of consular legates also had an impact on the nature of the aristocracy. More and more frequently these consular governors had their origins from outside Italy, and eventually included members of the native aristocracy. This illustrated a significant change in the composition of the aristocracy. Indeed, a consular legate from outside Italy - Trajan - became emperor during this period.
Hence, from Vespasian to Hadrian, there was continuity in the imperial administration as exemplified in the appointment of consular legates, with each succeeding emperor maintaining and developing the pattern established by Vespasian.