As casting picks up steam on WB/Legendary Pictures' 300 follow up (not a prequel, not a sequel..a sidequel?), the newest addition is 21 year old Jamie Blackley who has a small role in Snow White And The Hunstman, and just wrapped on the strangely titled uwantme2killhim? in which he played the lead.
According to Deadline..
Blackley will play Calisto, a teen whose desire to become the heroic man/soldier his father was leads the 16 year old to become a leader of a small band of soldiers.
He joins Sullivan Stapleton as main character Themistocles, and Eva Green as Artemisia.