What date did Bagsecg die?
Bagsecg: Bagsecg (also known as Bægsecg or Bagsec) (died 8 January 871) was a Viking leader commonly referred to as a king. Bagsecg:  He was killed at the Battle of Ashdown, fighting a West Saxon Army led by King Ethelred and his younger brother, the future Alfred the Great. Battle of Ashdown: The Battle of Ashdown, in Berkshire (possibly the part now in Oxfordshire), took place on 8 January 871.
8 January 871