Where are you in northern Italy? There are online lists of native and naturalized roses that you can look up for your area, as well as reference books.
To help you in your researches, R. helenae is native to China, and unlikely to be naturalized in your area, though the world of plants is full of surprises. It's a member of Synstilae, with fused styles that are the distinctive feature of this group. Does your rose have fused styles? If it does, it might be R. arvensis, which with R. sempervirens (not native to my own province of Piacenza) are the two members of Synstilae found with a certain frequency in Italy. R. arvensis grows wild in my area.