Legend has it
'Legend has it' introduces a story that has been told for a long time (true or not)
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The phrase “legend has it” is used to introduce a story or information that has been told for a long time. It means that what comes next might not be proven as a fact but is part of a story or legend. It’s a way to say that the information is like a myth or a popular tale, and it’s often used in a playful or uncertain way.
For example, “Legend has it that a treasure is hidden in the old, empty house” suggests that there’s a story or rumor about a hidden treasure, but we can’t be sure it’s true.
Legend has it that a messenger ran from Marathon to Athens, 26.2 miles, delivered a message, and then died from exertion. That’s how the modern marathon length was calculated. Is that completely true? I don’t know. But that’s how the story goes–so we say “legend has it” that it happened that way.