Crossword Genius

Roman emperor who was the adopted son and successor of Trajan (7)

Ross

I believe the answer is:

hadrian

(Other definitions for hadrian that I've seen before include "Imperial wall-builder" , "Roman emperor and wallbuilder" , "His wall crosses northern Britain" , "Roman Emperor after Trajan" , "Roman emperor who visited Britain" .)

I've seen this clue in The Independent.
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