The first leads to the era of constant raiding of the coasts of Britain and Ireland, the second to their eventual settling in England after a lot of fighting. 865 AD: The Great Heathen Army, also called the Great Viking Army and supposedly led by the sons of the legendary Viking Ragnar Lodbrok, arrives in Englandīoth of these are sort of seen as heralding the arrival of different phases of Viking activity.793 AD: The first major Viking raid on the monastery of Lindisfarne.When you think of Viking Britain, two dates really come to mind: As this is the first blog, it feels best to start with the first question that will come to mind for those familiar with the history of this era. Hello and welcome to the first in a series of blogs from lead developer Jack Lusted that will talk about the core decisions behind the design and direction of A Total War Saga: Thrones of Britannia.