The first Roman emperor to use portraitures for communicating his ideologies to the Roman populace was

Augustus was the first Roman emperor to use portraits.

The first Roman emperor to use portraitures for communicating his ideologies to the Roman populace was Augustus. Beginning with Augustus, the emperors of the imperial period made full use of portrait sculpture's potential as a tool for communicating specific ideologies to the Roman people. One of Augustus’ most famous portraits is the so-called Augustus of Primaporta of 20 B. C. E. In fact, in this portrait Augustus shows himself as a great military victor and a staunch supporter of Roman religion.