A Roman Catholic belief, but not supported by the Old or New Testament.
The Roman Catholic can seemingly do nothing without Mary.
It is believed that after the Queen of Sheba came home after visiting King Solomon, she had a son by the name of Menilek. 20 years later he came to Judah and took home the original Ark of the Covenant to what became the country of Ethiopia.
Mary IS the NT the Ark of the Covenant.>
Mary was beautifully prefigured by the Ark of the Covenant.
The Ark carried sacred objects --- flakes of manna and the tablets of the Law --- associated with God's saving work toward the Hebrew people. And Mary carried not manna, but the Living Bread; not the Law, but the Lawgiver; she carried not just the saving of the Hebrew people, but the Savior of the World.
Actually it’s supported directly by Revelation 11:19 going into chapter 12. It would be hard for it to be better supported than that.