Roman emperor from 117-138 known for the wall built in Britain as a defence against the northern tribes (7)

I believe the answer is:

hadrian

(Other definitions for hadrian that I've seen before include "Roman emperor and wallbuilder" , "Wall-building Roman emperor" , "Imperial wall-builder" , "Roman emperor who built the British wall" , "Roman emperor who visited Britain" .)

I've seen this clue in The Mirror.

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