Lothaire Bluteau ("The Tudors"), Kevin Durand ("The Strain") and Morgane Polanski ("The Ghost") will join the rest of the cast, as well as previously announced Ben Robson, who will play Kalf, Lagertha's (Katheryn Winnick) trusted second in command.
Bluteau is set to play Emperor Charles of France, with Durand as The Wanderer, a mysterious man who is not what he seems. Polanski will play Princess Gisla, the elegant, self-possessed daughter of Emperor Charles and his most trusted advisor.
Created by Michael Hirst, "Vikings" centers on Ragnar (Travis Fimmel), a warrior who longs to find and conquer new lands.
Season three is set to premiere in 2015.
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