Viking

The Vikings were Scandinavian pirates and traders who plundered Europe from the 8th to 10th centuries.

Culture
Viking culture was predominantly focussed on the concept of honour - the Twelfth Doctor said that dying with honour, as opposed to without, made "all the difference in the world" to Vikings. In a similar vein, a typical Viking would rather die fighting than live as a coward. (TV: The Girl Who Died)

Being the only widely known representatives of their people, the Viking moniker became synonymous with Nordic culture as a whole. (TV: The Curse of Fenric) Vikings spoke Old Norse. (PROSE: The Spear of Destiny) The TARDIS wardrobe included Viking clothing. A Viking outfit was among the choices considered by the Fourth Doctor for his new outfit just after his regeneration. (TV: Robot)

History
During the 9th century, a group of Vikings stole the flask containing Fenric, taking it to Northumberland and Maiden's Point. They buried the flask beneath St Jude's Church, leaving a runic inscription warning that the flask was cursed. Their descendants settled the area. Among the Vikings were Asmund, Rognvald, Torkel and Halfdan. (TV: The Curse of Fenric)

Also during this century, the Twelfth Doctor and Clara Oswald were captured by a Viking raiding party and taken to their village. Shortly afterwards, the village was visited by the Mire, whose leader appeared in the form of Odin to invite the Vikings to dine with him in Valhalla. In reality, the warriors of the village were captured and taken to the Mire's ship, where they were liquefied for sustenance. (TV: The Girl Who Died)

In 1066, the Monk planned to sabotage a Viking raid in order to ensure King Harold Godwinson's victory at the Battle of Hastings, but was prevented from doing so when a group of Saxons ran the Monk out of his monastery. (TV: The Time Meddler)