Book suggestions for Barbarossa/ Attila/El Cid?

I love reading about history, and especially about great historical figures, I believe the spark was lit by AoEII especially, since I love both that period and the game (which I still play). I have read the following books and would love to hear suggestions on nicely written books on Barbarossa, Attila, or El Cid, since the AoC are the best campaigns in my opinion.

The books I have read thusfar if someone is interested to read themselves:

• Joan of Arc by Helen Castor. Bit drier than the other ones, but still a nice read.
• Saladin by John Man, very nicely written book on how Saladins life played out.
• God’s Wolf by Jeremy Lee about Reynald de Chatillon (Saladins nemesis which can be found in campaigns 2 and 3 if I am not mistaken). Tells the story of the second crusade from a Western perspective, great read.
• Genghis Khan and the making of the modern world by Jack Weatherford. Out of all these books the best in my opinion, with not only focussing on Genghis’ life and conquest but also about Mongol life in general including laws, food, customs etc.
• Attila (3 books) by William Napier, which is historical fantasy, overall a great read but would like to have more of an overview and historically sound read.

Thanks in advance if someone has any suggestions!