The Legate\'s Daughter by Wallace Breem

[Niedel]

It's so difficult for me to believe Anthony Mann directed El Cid, a great film, IMO.

Really? In my opinion, Anthony Mann was a great director. His westerns are great, and the part of "Spartacus" he shot before Stanley Kubrick got involved is almost my favorite part of the movie, the gladiator school, the escape from it etc.
Apart from that, I think the producer, Samual Bronston, had probably as much to do with how King of Kings, El Cid, FOTRE and 55 Days in Peking (the other epics he produced) turned out as the individual directors, good or bad.