The English begins with the phrase 'Up' Yours Caesar!' as the Romans leave Britain and a lot of GGermanic tribes start flooding in, tribes such as the Angles and the Saxon - who together gave us the term Angli-Saxon, and the Jutes - who did't.
The Romans left some very straight roads behind, but not much of their Latin language.
The Anglo-Saxon vocab was much more useful as it was mainly words for simple everyday things like 'house', 'woman', 'loaf' and 'werewolf'.