In 530 AD, Stephanos of Byzantium added more to this idea when he wrote in his Ethnica that the word "pyramid" was connected to the Greek word πυρός (puros), meaning wheat.[66]

The Abbasid Caliph Al-Ma'mun (786–833 CE) is said to have tunneled into the side of the Great Pyramid.
In the seventh century AD, the Rashidun Caliphate conquered Egypt, ending several centuries of Romano-Byzantine rule. A few centuries later, in 820 AD, the Abbasid Caliph Al-Ma'mun (786–833) is said to have tunneled into the side of the structure and discovered the ascending passage and its connecting chambers.[67] Around this time a Coptic legend gained popularity that claimed the antediluvian king Surid Ibn Salhouk had built the Pyramid. One legend in particular relates how, three hundred years prior to the Great Flood, Surid had a terrifying dream of the world's end, and so he ordered the construction of the pyramids so that they might house all the knowledge of Egypt and survive into the present.