St Augustine was sent to Britain in AD 597 and became the first Archbishop of Canterbury

Explanation

St Augustine became the first Archbishop of Canterbury in AD 597. St Patrick is associated with Ireland, St Columba with Scotland and Iona, and St Thomas Becket was a later Archbishop of Canterbury who was murdered in 1170.

Explanation

St Augustine became the first Archbishop of Canterbury in AD 597. AD 410 is when the Romans left, AD 793 is the Viking raid on Lindisfarne, and AD 878 is the Battle of Edington.