Peter Robins, his website

The Roads to Santiago - Route Details

Montgenèvre-Arles GR653D
Via Domitia

The Amis de St Jacques Provence-Alpes-Côte d'Azur-Corse and the FFRP have created a route, roughly following the Via Domitia, from the Italian border at Montgenèvre (1850m) and Briançon to Arles.
A link from the Col de Larche (1991m) to this route at St-Geniez, via Barcelonnette and Seyne, is also under development.
See Via Francigena page for link to/from Vercelli and Rome.