How does a movie become a Biblical epic? Simply by quoting a couple of Scriptures & using some names out of the Bible for your characters? The only thing that was Biblical about this epic was the names of the characters. Oh, I almost forgot the 3 kingdoms, Israel, Egypt & Sheba were also used. Where did King Vidor get the rest of his story from? It surely wasn't from the Bible. It was complete & utter nonsense. If you want to read about Solomon's reign as King in Israel then read 1 Kings 1-11 & 2 Chronicles 1-9. You will even come across Adonijah in 1 Kings 1 & 2. The Queen of Sheba, (who doesn't show up until King Solomon has been king for about 20 years or so, which by the way, is long after Adonijah & Joab had been dead) can be found in 1 Kings 10 & 2 Chronicles 9. One of the first thing Solomon does is make an affinity with Pharoah by taking his daughter.
Yes, King Solomon did get involved with the worshipping of false gods & this is why the Kingdom was split after his death, not the Temple being destroyed by lightning. Also, I think Solomon was too busy marrying & providing temples to the false gods of his 700 wives & tending to his 300 concubines to be fighting Egypt, let alone a dead brother.
Like I said this movie was utter nonsense. If you aren't gonna use the story in the Bible then call it something else. This could've just as easily been called Romeo & Juliet or Sid & Nancy.