Answering those questions here to avoid muddying another discussion even more than it already is.
Julius is explicitely defined and was built as a Magic Thing (see his stats), an object, that developped awareness. That is a result of a powerful Twilight experience involving Muto. The fact that Julius believes itself to be the Roman grammarian Gaius Julius Solinus is basically a Delusion (even though I did not take the flaw). More likely, it is just imprinted with part of the "spirit" of the grammarian, for some undetermined reason.
So not a transformed human at all.