The implied subject of a noun phrase

News of Caesar's assassination spread fast in Rome and struck terror into Caesar's close associates, who believed that they too might be targeted for death. With some others, the commander of Caesar's military guard, Lepidus, had a failure of nerve and did not mobilize his troops against the assassins. Two days after the assassination, Mark Antony, seeing no reign of terror, emerged in public with a personal guard that he had organized. Still afraid, he was ready and willing to compromise with the Senate, and he made his now famous speech about burying rather than praising Caesar – his ability as a speaker to be exaggerated by Shakespeare. As the surviving consul he accepted power and spoke favorably of the powers of the Senate.
<Caesar's Reforms and Assassination http://www.fsmitha.com/h1/rome14.htm>
I'd like to know if the subject of "no reign of terror" is "Roman citizens."
Thank you in advance for your help.