Gianluca,
I may think that this could be Fürst Reinhard Ludwig zu Solms-Hohensolms-Lich.
The writing on the pict seems to end with "Solms" and the word before is maybe "Comte"? (italian?)
Fürst reinhard Ludwig (1867-1951) was Obersleutnant in the GdC and Kommandeur of this unit between 1915 and 1917.
Philippe
:wink: