What is this pollinator's name?
I'm not an entomologist, but it seems to me that this bee is a Xylocopa, or a carpenter Bee:


Xylocopa iris

If this is, in fact, a Xylocopa, narrowing it down to the species level will be very difficult, since the Genus has more than 500 species. You could start with one of the most common carpenter bees in Europe, Xylocopa violacea:


Xylocopa violacea

However, I believe that this may be in fact Xylocopa violacea because of the antennae: you can see a little orange stripe next to the tip of the antenna in the bee of your photo, just like in the bee of the photo above.