The iconic director may helm the screenplay titled 'Montezuma', penned 50 years ago, with Oscar-winning actor Javier Bardem in lead role, reported Ace Showbiz.
The script revolves around the conflict between Aztec's emperor Montezuma and Spanish explorer Hernan Cortez as the latter led an expedition to Mexico to add to Spain's riches.
The planned big-screen adaptation by Dreamworks could be renamed "Cortez" since it is expected to be told from the conquistador's point of view.
Trumbo had won Oscar award twice, once for penning 'The Brave One' in 1956 and once for the 1953 release 'Roman Holiday'.