coollector.com

movie: Last Crusade (1971) [0045947] definetely has a wrong video associated, cannot recognize it which video is this one but is not Mihai Viteazul for sure.

I think it's the right video (a german video of the movie).

http://www.amazon.de/Die-Kreuzritter-Kampf-K%C3%B6nige-Teil/dp/B0014YEDIQ

http://www.buecher.de/shop/action/die-kreuzritter-der-kampf-der-koenige-teil-12/dvd/products_products/detail/prod_id/28192303/

you are right, production, actors seems to be ok, but the cover is from somewhere else, but not from this movie

Even the IMDb points to this german title. I don't know why they chose this cover, but I think the movie is right