generate questions: Viking raids from 840 onwards contributed to the decline of Hamwic in the 9th century, and by the 10th century a fortified settlement, which became medieval Southampton, had been established.
What kind of raids disturbed Hamwic in the 9th century? {sep_token} What year did the Vikings start attacking Hamwic? {sep_token} In what century was a new settlement set up at the site of Hamwic? {sep_token} What was the name of the 10th-century fortified settlement that took Hamwic's place? {sep_token}