Looks like within Viola calcarata group; perhaps Viola eugeniae, Parlatore 1875? Viola calcarata - Wikipedia Viola calcarata - Specie della flora italiana Viola eugeniae - Specie della flora italiana
I would still lean Viola calcarata, because of the white flush in the throat of the flower (which is lacking in those photos of Viola eugeniae)--but maybe that isn't diagnostic?