The pyramid is thought to belong to a vizier, or senior adviser, called Khay, who worked under the reign of pharaoh Ramses II during around 1279-1213 B.C., judging by the stamp impressions found on the brick.
The vizier, who was the highest official under the pharaoh, would have supervised the workers in charge of building the royal tombs in the Valley of the Kings and the Valley of the Queens. Khay is known to Egyptologists through many documents.
The pyramid, situated on the Luxor West Bank -- the site of the ancient city of Thebes -- originally stood about about 50 feet high, and its side measured about 40 feet, according to a statement by Universite Libre de Bruxelles and the Universite de Liege.
"Located high on the hill, overlooking the memorial temple of Ramses II, the pyramid must have been an impressive landmark of the Theban landscape," the universities wrote.
The mudbrick had been covered in whitish plaster and capped by a small topstone, or pyramidion, decorated with an image of the tomb's owner adoring the sun-god Ra-Horakhty.
Khay's tomb is immediately below the pyramid, but remains to be excavated as a modern village house has been built on top, the universities said.
The vizier's pyramid was built in the courtyard of an earlier tomb, which the Belgian team found in 2009. During the excavation of that tomb, the researchers also found fragments of wall paintings dating back to around 1479-1427 B.C.
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