He was Julius Caesar's nephew and successor, who ultimately did all of the things that Caesar wanted to do but never had a chance to to see done (the month of August is even named after him). In the lines that Paul mentioned his legacy, I think he means that someone similar to Steve Jobs (his would-be successor in our pop culture) could continue a similar path as Jobs. It's now clear that being a visionary in that position is possible, and he showed us all what just one person can do there.