In the late 20th century, a British prime minister looked at her country, saw that it was in decline and set out to reverse that decline; her name was Margaret Thatcher. In the mid-fourth century a Roman emperor looked at the Roman Empire and saw that it was in decline and set out to reverse that decline: his name was Julian the Apostate.
Hmm. I am not convinced that the analogy is that close. Julian was hardly the first emperor to try and reverse the decline that he saw in Rome (Decius perhaps?), nor is it especially accurate to claim that he is "the only noteworthy emperor in the fourth century after Constantine". Theodosius anyone? But it is worth a read.