Fresh 33+ Vikings Season 4 Actors. The series broadly follows the exploits of the legendary viking chieftain ragnar lothbrok for faster navigation, this iframe is preloading the wikiwand page for vikings (season 4). The fourth season of the historical drama television series vikings premiered on february 18, 2016 on history in canada. The fourth season of the historical drama television series vikings premiered on february 18, 2016 on history in canada.