The fourth king of the 4th Dynasty (c 2575-2465 BC) of Egypt, Cheops' (Khufu) son. Chephren erected the second pyramid of the Giza group as well as the Great Sphinx. He reigned c 2540 BC. The middle pyramid was and measures 707 3/4 feet (216 m) on each side and was originally 471 feet (143 m) high. Many consider the Great Sphinx to bear Chephren/Khafre's features.