I just read a very good book called "The Four Roads to Heaven: France and the Santiago Pilgrimage" by Edwin Mullins. The author describes treks originating in Paris, Vézelay, Le Puy-en-Velay, and from Arles - crossing France to join as a single road in Spain. I'm very interested in the camino and the pilgrims who make the journey. Good read.
This is a great website for information on the Camino de Santiago. My wife and I have walked the Camino four times. A very worthwhile experience. Life changing for some.