Who were the vikings and how did they raid europe

The Vikings first invaded Britain in AD 793 and last invaded in 1066 when William the Conqueror became King of England after the Battle of Hastings. The first place the Vikings raided in Britain was the monastery at Lindisfarne, a small holy island located off the northeast coast of England.

The constant presence of diseases or infectious agents within a given geographic area or population group. it may also refer to the usual prevalence of a given disease with such area or group. it includes holoendemic and hyperendemic diseases. a holoendemic disease is one for which a high prevalent level of infection begins early in life and affects most of the child population, leading to a state of equilibrium such that the adult population shows evidence of the disease much less commonly than do children (malaria in many communities is a holoendemic disease). a hyperendemic disease is one that is constantly present at a high incidence and/or prevalence rate and affects all groups equally. so probably family history.