Answer: hadrian

AnswerCrossword Clue
HADRIANNoted wall builder
HADRIANTrajan's successor
HADRIANRoman emperor who visited Britain
HADRIANHe built the Temple of Venus and Roma
HADRIANBritish wall builder
HADRIANOne of Machiavelli's "Five Good Emperors"
HADRIANBuilder of Roman wall in Britain.
HADRIANRoman emperor: 117-38
HADRIANEmperor nicknamed "Little Greek"
HADRIANEmperor with a wall named for him