Archeologists have unearthed a cache of Pharaonic-era mummies in brightly painted wooden coffins near Egypt's little-known Lahun pyramid, the site head said on Sunday. The mummies were the first to be found in the sand-covered desert rock surrounding the mud-brick Lahun pyramid, believed to be built by the 12th dynasty pharaoh Senusret II, who ruled 4,000 years ago. The site was first excavated more than a century ago. “The tombs were cut on the rock itself, and they vary in architectural designs,” said archaeologist Abdul Rahman Al-Ayedi, head of excavations at the site. “Most of the mummies we discovered were with these bright and beautiful colors.” At the site, bare skulls from some of the mummies sit on a hillside while workers gently brush away sand from coffins below the earth that bear images of their occupants, some painted in striking hues of green, red and white. Ayedi said the dozens of tombs dotting the site near Fayoum, 60 km (35 miles) south of Cairo, could give insight into the development of Egyptian funerary architecture and traditions from the Middle Pharaonic Kingdom all the way to the Roman era. “The prevailing idea was that this site has been established by Senusret II, the fourth king of the 12th dynasty. But in light of our discovery, I think we are going to change this theory, and soon we will announce another discovery,” he told reporters. Ayedi said he had wanted to excavate at Lahun, Egypt's southernmost pyramid, because he was not satisfied with the result of the first excavation there in the 19th century.