Biographies of Robert the Bruce, etc

<p style=”text-align: center;”>I’m having trouble finding any-not to mention a good-children’s biography of Robert the Bruce, William Wallace, and sand other English or Scottish notables of the 1200s and 1300s. Can anyone help me with this? I am not talking about historical fiction, my son has already listened to In Freedom’s Cause and I think he would enjoy digging deeper if I could get some good books. Thank you.</p>