What happened in 855 ad?

Answer 1

In 855 AD, a notable event was the death of Pope Leo IV, who had served as pope since 847. His papacy was marked by efforts to strengthen the Church and defend Rome against Saracen attacks. Additionally, the year saw the continuation of the Viking expansion across Europe, as they began to establish settlements and exert influence in various regions, particularly in the British Isles and along the rivers of France.