Thanks everyone! It is most interesting puzzle, I have obtained so called Crusaders and some of them appeared normans of Wilhelm the Conquerer, although we all understand that sometimes there is no difference between those two!
Anyway, I saw List of Mullers figures about 10-15 years ago, it was incomplete, but yet it was! I can not remember where it has gone.
I believe that there was (or at least should be) some kind of plan of Muller’s collection, original idea or kind of!