De Niros movie was made in 2000-much later than the one that Seagal was looking at-anyways I found this article
Steven Seagal v. Saudi Prince
Filed: October 20, 1997
Los Angeles County Superior Court
The Case: You'd think Prince Abdulilah bin Abdul Azia al Saud would think twice before crossing screen ass-kicker Steven Seagal. After all, as any fan of Mr. Hard to Kill can tell you: You tick off Stevie, you in for a world of hurt.
Still, according to a lawsuit filed by the action hero-cum-aspiring blues singer, the prince (a half brother to the very rich King Fahd) reneged on a deal to bankroll a Seagal flick called Man of Honor.
But instead of flying to Saudi Arabia to kick some royal butt (maybe Seagal's a changed man since being named a reincarnated lama), Seagal and his Seagal/Nasso Productions are taking the prince to court. He has filed a $25 million lawsuit claiming breach of contract, intentional misrepresentation and negligent misrepresentation.
Backstory: According to Seagal's legal team, the prince and the movie star met in 1992, with the royal agreeing to finance Man of Honor for $30 mil in exchange for international distribution rights.
That promise was enough to get the 47-year-old, squinty-eyed, ponytailed Aikido master (and, as of last June, a sacred vessel of Tibetan Buddhism) working in earnest on the project. However, after only sending $1.65 million, the prince pulled the plug, the suit says.
Seagal claims he spent his own money developing the aborted feature and that the prince offered no reason for killing the deal.
Status: The prince was served with a writ on November 25 but has not yet responded.