“In 2018 excavations in the Ophel – the raised area between the City of the David and the Temple Mount – produced a fragmented clay bulla or round seal dating to the eighth or seventh century BC inscribed with the name of the owner, Isaiah the Prophet.”
In 2018, archaeologist Eilat Mazar published an article in Biblical Archaeology Review, presenting the clay seal to the world.
If an inscription on the seal does indeed mention the Hebrew prophet, then it is the first extrabiblical source confirming his existence.
Professor Meyer, who is an expert in Middle Eastern languages, said: “In the ancient near east, seals were often engraved with the name of the owner and could function as a legal signature.
source: express.co.uk