To the East of Chefren's pyramid. Who built it? The Valley Temple attributed to king Chefren , one of the kings of the 4th Dynasty . Why was it built? This temple served definitely two functions: First, it was used for the purification of the mummy of the king before its burial. Second, it was used for making the Mummification process of the king. Explanation: The best preserved valley temple all over Egypt it was built of local limestone, it was partly covered with fine Tura limestone and partly by ashlars of red granite. It was built on square plane, measuring 482 feet on each side. This temple has been buried under the desert sand until the 19th century.