Answer: Here are a few things to consider:
Do you want something that actually clings to the masonry? I'm not sure if this type of vine would damage such an old building, so you may want to consult with a local specialist. Even if the vine doesn't damage the stone directly, the foliage will shade the wall and hold in moisture. Just something to consider.
If you want a vine that will cling, you'll need one that climbs with "holdfasts" -- little suction-cup like disks -- such as English ivy. Unfortunately, this is neither flowering nor fragrant.
Another option might be to "espalier" a tree along the wall. This consist of training a tree to grow on support wires secured to the wall, so that it lies in a plane near the wall. This is most often done with fruit trees. Unfortunately, they are not evergreen, and don't grow that tall.
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