Are there any idioms and proverbs that contain dragons in English?

I thought of an idiom): here be dragons is often used in18th century, especially on maps. Mark some remote places that are thought to have monsters to warn people not to go there.

Most proverbs containing dragons come from China, but I found an interesting proverb from Italy.

Better be a lizard head than a dragon tail.

Better to be a lizard's head than a dragon's tail, similar to China's "Better to be a chicken's head than a phoenix's tail".