He twice avoided war with Parthia and he put down Bar Kokhba's Revolt, but he also defified his drowned lover, the Greek youth Antinous.
In Rabbinic sources, this ruler's name is accompanied by "may his bones rot," and early in his reign he had Lusius Quietus and three other senators executed.  His original choice as successor was the tubercular Lucius Ceionius Commodus, who became Aelius Caesar.  He twice avoided war with Parthia and he put down Bar Kokhba's Revolt, but he also defified his drowned lover, the Greek youth Antinous. He built an extensive series of palisades between the Rhine and Danube after ceding much of the land his predecessor had conquered. For 10 points, name this emperor who was followed by Antoninus Pius, succeeded Trajan, and built a massive wall across Britain.
In Rabbinic sources, this ruler's name is accompanied by "may his bones rot," and early in his reign he had Lusius Quietus and three other senators executed.  
Hadrian [or Imperator Caesar Traianus Hadrianus Augustus or Publius Aelius Hadrianus]