Can anyone actually define what a "True Artist" is?

(This is a re-publishing of the content of my postings in a discussion started by Ron Croci on Linkedin under the same title as here above.)
The term "artist" in visual art has been in use for only a relatively short time. Before the Renaissance the "picture makers" were considered being craftsmen of very low social standing put in charge of illustrating the story of the Christian creed.