[franky8]

From the 5th Century: The Feast of the Assumption of Mary was celebrated in Syria.

The same testimony is clear also in the Western Church (Gregory, Tours, 538-594).

847 by Leo IV

1950
Pope Pius XII, declared infallibly, ex cathedra: “Mary, having completed the course of her earthly life, was assumed body and soul to heavenly glory.”

[Gurn]

So, hundreds of years after she walked the earth, somebody said she never died. And Pius, the Nazis' favorite Pope, had the final word.

Got it.