I think you`ve messed up something. The Polish Kings ruled over Prussia for over 200 years.
The same Albert Hohentzollern painted by Bacciarelli
marchand.pl/obrazy/bac_hold.jpg
I guess that guy just loved spending time on his knees.
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Well I think that everyone who`s interested in Polish history has knows everything about the Prussian Homage. What I find interesting though is something that I found out only some time ago while browsing thru the Wikipedia. It seems that Konigsberg before 1700 had had a Polish coat of arms
upload.wikimedia.org/wikipedia/en/b/bd/Krolewiecherb.PNG
Well, I had no idea about that. I wonder also if the Germans hated the Poles becaouse of all of that kneeing their monarh had to endure during the XVI and XVII centuries, after all it was under the Hohentzollerns when the Germans got their idea about their "superiority", "Kulturkampf" ect. A Hohentzollern also rulled Germany when WWI had started...