The back cover of "Balian d'Ibelin" requires not only text but images.
Below are three images.
1. The only medieval image I know of that depicts Balian d'Ibelin (holding Baldwin V in his arms)
2. One of several medieval illustrations that depicts Maria Comnena -- riding beside her first husband Amalric of Jerusalem.
3. A medieval illustration of a decisive victory -- albeit not Montgisard per se.
I was thinking either of both 1 & 2 or 3 alone.
Please let me know what you think.