Need help with possible German royalty

[Von Thronstahl]

These cabinet photos are part of a large lot I´ve recently acquired. Small part of the lot and main reason I bought the lot is Austrian royal family photos.  These were among them,  aswell as other non Austrian royalty but I´ve recognized them already.   Now I need help with these guys.  I think t I´ve seen one of the faces on some medals but I am not sure. 

 

 

[bolewts58]

The middle photo is of Kaiser Wilhelm I.

[Bayern]

Hello : they are prussians not austrians , the first Prince Friedrich Karl the second Kaiser Wilhelm I the third could be Prince Albrecht . 

[Hermann]

The third is king Leopold I of Belgium. He was a born Saxon.

[paul wood]

Queen Victoria's Uncle Leopold of Saxe-Coburg-Gotha, he married George IV's daughter Charlotte in 1816, she died the following year in childbirth, his nephew Albert married Queen Victoria in 1840. Well spotted Hermann

Paul

[Bayern]

Paul Wood : You have reason , the third is King Leopold , Roi des belges , he wears the iron cross 1st class , probably winned during the war against Napoleon when the then Prince of Sachsen coburg was a officer of the russian army .