This is a line from Ørberg's Roma Aeterna. I am not sure I understand prae se agit. It seems odd to imagine Aeneas driving Dido before him as a ploughman drives an ox. I believe I have found the original verse in the Aeneid: Agit ipse furentem in somnis ferus Aeneas. I suppose this could mean that he drives her crazy. What are your thoughts?