Pelagius probably walked to Rome.

Pelagius walked from Britain to Rome in order to counter the FALSEHOOD of the Doctrine of ORIGINAL SIN.

He would have probably covered about 15 miles a day and the journey would have taken him maybe a month or so.

Those were the days!

No petrol driven chariots. Lucky git!

And we call the 6th century The DARK Ages?

Maybe "Dark Age" people would call us The FUMES AGE!....  :(

Your Augustinian or Determinist will complacently and quiescently say something like :
"We are doomed as a species to invent and use things like automobiles. There is nothing we can do to change this about ourselves yada yada yada .."....etc....or something like this.....and so on and so forth.....

Yet a Pelagian or believer in Free Will can say simply say:
"They are a choice. We have our freedom.
We can chose to make them or not ; or to use them or not!"....

In this case - and in many others - I think we can all see that the Pelagian view must be correct.