Final answer:
The Romans conquered southern Britain, built roads and Hadrian's Wall, introduced laws and cultural customs, named the months, and had to withdraw their legions as the empire faced difficulties.
Step-by-step explanation:
The Romans conquered the southern part of Britain around 55 B.C. but did not conquer Scotland. They introduced the law as well as the customs of the great empire. They built in Britain a system of very good Roman roads which have survived to this day.
In order to protect themselves from the avenging raids of the Celts in the north, they built great fortifications such as Hadrian's Wall by the end of the 4th century. Rome had to withdraw its legions as the Roman Empire itself was in trouble. The Romans gave the names of all months in English; some of the British modern laws are based on Roman laws.