Context: From the middle of the 3rd century Germanic tribes regularly invaded the Roman territories. Around 275 the Romans could no longer maintain the northern border and Utrecht was abandoned. Little is known about the next period 270–650. Utrecht is first spoken of again several centuries after the Romans left. Under the influence of the growing realms of the Franks, during Dagobert I's reign in the 7th century, a church was built within the walls of the Roman fortress. In ongoing border conflicts with the Frisians this first church was destroyed.

Question: Who raided German territories regularly 
Answer: Germanic tribes regularly invaded the Roman territories.

Question: When did the Romans leave Utrecht
Answer: Around 275 the Romans could no longer maintain the northern border and Utrecht was abandoned

Question: What happens between 275 and 650
Answer: Little is known about the next period 270–650.

Question: What was built in the 7th century 
Answer: a church was built within the walls of the Roman fortress

Question: How was the the church destroyed 
Answer: In ongoing border conflicts with the Frisians this first church was destroyed.

Question: Who started invading Roman territories during the mid 300's?
Answer: Unanswerable

Question: Who abandoned Utrecht in the 2nd century?
Answer: Unanswerable

Question: Who ruled the Franks in the 700's?
Answer: Unanswerable

Question: Wat was built inside the Roman fortress in the 700's?
Answer: Unanswerable