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I believe it's the Violet Ground Beetle - Carabus violaceus. This is a close relative to the Carabus coriaceus posted by Jon. The purple colour is a give away, but I have to state that I'm no beetle expert and can not say whether there are very similar species. In many insect groups this is often the case. There are websites like observado.org where ...
I would say that it is a Carabus coriaceus. It might have a size of 30 to 40mm and is very common around Europe. Unfortunately the English wikipedia article is rather tiny: https://en.wikipedia.org/wiki/Carabus_coriaceus
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