Thank you very much for your last corrections!

Could you possibly check these other sentences, too? Thank you.

1) In 43 AD the island was conquered by the Romans, who introduced their language and culture and built towns connected by roads.
2) In 409 the Roman soldiers withdrew from Britain to repel a Barbarian attack. After the retreat of the Romans the island was occupied (?) by the Anglo-Saxons, who were organised in tribes and were skilled farmers and deep sea fishermen.
3) Thanks to the monk Augustine, who was later appointed archbishop of Canterbury, Christianity regained its importance (?) on the island.
4) The Vikings took control of Britain in 8th century.
5) Only in 14th century there was an important (?) growth of the middle classes, whose members became more important (?) than noblemen.
6) In this period (?) the Church took (? played) an important role since people were very religious (?) and thought that the real life was the one after death.
7) During the Middle Ages Christianity spread all over England (or became the most widespread religion in Britain) thanks to the role played by the monks
8) The monks played a fundamental role in the spread of Christianity in England.
9) Great Britain originated from a gradual settlements of various tribes, first of whom the Iberians followed by the Celts.

1 - fine

2 - No capital B on "barbarian

3 - fine

4 - "in the 8th century"

5 - "in the 14th century" -- use "significant" rather than "important" to describe "growth" -- not sure how middle class people could be more important than noblemen!!

6 - "played an important role"

7 - comma after "Ages" -- keep the wording in parentheses -- comma after "Britain"

8 - fine

9 - delete "a" -- "the first of whom were the Iberians..."

1) In 43 AD, the Romans conquered the island, introducing their language and culture, and constructing towns connected by roads.

2) In 409, Roman soldiers withdrew from Britain to repel a Barbarian attack. After the Romans retreated, the island was occupied by the Anglo-Saxons, who were organized in tribes and skilled in farming and deep-sea fishing.

3) Thanks to the monk Augustine, who was later appointed archbishop of Canterbury, Christianity regained its importance on the island.

4) The Vikings gained control of Britain in the 8th century.

5) It was only in the 14th century that there was significant growth of the middle classes, whose members became more important than noblemen.

6) During this period, the Church played an important role, as people were very religious and believed that real life existed after death.

7) Throughout the Middle Ages, Christianity spread across England thanks to the role played by monks. (or became the most widespread religion in Britain)

8) Monks played a fundamental role in the spread of Christianity in England.

9) Great Britain originated from the gradual settlements of various tribes, beginning with the Iberians and followed by the Celts.