Day of the Falcon (2011)

In the early 20th century, Emir Nesib (Antonio Banderas), Sultan of Hobeika, and Sultan Amar (Mark Strong) of Salmaah have been in a border war over a vast barren strip they call “The Yellow Belt”. When Nesib wins he forces Amar to agree to a peace pact: the Yellow Belt will belong to neither, becoming a no-mans-land between their territories, and Emir Nesib will take Sultan Amar’s sons, Saleh and Auda, as hostages. Amar reluctantly agrees, knowing the hostages are a sacred trust which binds Nesib as well. They both swear to the pact before God. Nesib promises to rear Amar’s sons with his own children, Tariq and Leyla.