For 10 points, name this Roman emperor, the successor to Trajan known for his eponymous wall at the border between England and Scotland.
His service as archon of Athens was memorialized in an inscription in the Theater of Dionysus, and he was given the title Olympius after the temple of Zeus was dedicated. During his reign, cults for his late companion Antinous were established, and towards the end of his reign his rival Julius Servianus was executed. He initially picked Lucius Aelius Caesar to be his successor, and he faced the Jewish revolt of Bar Kokhba. For 10 points, name this Roman emperor, the successor to Trajan known for his eponymous wall at the border between England and Scotland.
His service as archon of Athens was memorialized in an inscription in the Theater of Dionysus, and he was given the title Olympius after the temple of Zeus was dedicated.
Hadrian