<P> The third season of the historical drama television series Vikings premiered on February 19, 2015 on History in Canada, and concluded on April 23, 2015, consisting of ten episodes . The series broadly follows the exploits of the legendary Viking chieftain Ragnar Lothbrok and his crew, and later those of his sons . The first season of the series begins at the start of the Viking Age, marked by the Lindisfarne raid in 793 . </P> <P> The third season follows the development of Ragnar's family, and the Vikings as they become more entwined in English affairs, and also begin to raid further afield . </P> <Ul> <Li> Travis Fimmel as King Ragnar Lothbrok, the head of the Viking earldom of Kattegat who became king after Horik's death </Li> <Li> Katheryn Winnick as Lagertha, a shieldmaiden and Ragnar's ex-wife; she controls the Earldom of Hedeby calling herself Earl Ingstad . </Li> <Li> Clive Standen as Rollo, a warrior and Ragnar's brother </Li> <Li> Jessalyn Gilsig as Siggy, widow of Jarl Haraldson and Rollo's lover </Li> <Li> Gustaf Skarsgård as Floki, a gifted shipbuilder and friend of Ragnar's </Li> <Li> George Blagden as Athelstan, an Anglo - Saxon monk from Northumbria who is torn between the Viking gods and the Christian God; he is a friend and adviser to both King Ragnar and King Ecbert . </Li> <Li> Alexander Ludwig as Bjorn Ironside, Ragnar and Lagertha's son, who has fallen in love with the shieldmaiden Þórunn </Li> <Li> Alyssa Sutherland as Queen Aslaug, Brynhildr's daughter and Ragnar's second wife </Li> <Li> Ben Robson as Kalf, the ruler of Hedeby in the absence of Lagertha </Li> <Li> Kevin Durand as Harbard, a wanderer </Li> <Li> Lothaire Bluteau as Emperor Charles of West Francia . </Li> <Li> Linus Roache as King Ecbert of Wessex, the ruthless king of Wessex </Li> </Ul> <Li> Travis Fimmel as King Ragnar Lothbrok, the head of the Viking earldom of Kattegat who became king after Horik's death </Li>

Who plays the wanderer in vikings season 3