Pic will be helmed by Edward Zwick, from a script by Zwick and Marshall Herskovitz.
Story looks at the mystery behind how China’s Great Wall was constructed from a story conceived by Legendary Pictures chairman Thomas Tull and Max Brooks. Legendary had no comment on the casting.
Pic will be produced by Zwick, Herskovitz, Tull and Legendary’s Jon Jashni along with Atlas Entertainment’s Alex Gartner and Charles Roven.
The pic is the first to come from the banner launched in June by Tull and Asian investors, with the goal of producing one or two event films a year.
Cavill had been best known for his role on Showtime’s “The Tudors” before landing the coveted “Man of Steel” lead.
Besides “Man of Steel,” Cavill also has heat from his starring role in Relativity’s “Immortals,” which has grossed more than $200 million worldwide.
He is repped by CAA and United Agents.