de l'histoire ancienne

old news

→ de
phrase Rare #36,547
old news An idiomatic expression used for something in the past that is no longer important or relevant; literally, “ancient history.”
FR: Ne t'inquiète pas, cette dispute, c'est de l'histoire ancienne.
EN: Don't worry, that argument is old news.

Mais c'est de l'histoire ancienne.

But that's ancient history.

Mais c'était devenu de l'histoire ancienne en un instant.

But it had become ancient history in an instant.

— Departures (2008)

De l'histoire ancienne.

From ancient history.

C'est de l'histoire ancienne.

That's ancient history.

— Crazy Rich Asians (2018)

Et dans quelques semaines, vous serez de l'histoire ancienne.

And in a few weeks, you’ll be a thing of the past.

— Chicago (2002)

De l'histoire ancienne!

That's ancient history!

— Le Tambour (1979)

C'est de l'histoire ancienne!

That's ancient history!