According to one account, Moses led the Israelites through Wadi Musa on the way to the Promised Land. Several sites here are related to this, including ‘Ain Musa, the Spring of Moses, and Jebel Haroon, where Moses’ brother Aaron died. Not far from these is the summit of Umm el-Biyara, associated with biblical Sela (the Rock), and renamed Joktheel by King Amaziah of Judah after he defeated ten thousand Edomites there. Wadi Musa, or the Valley of Moses, is also the home of Petra—one of the ancient world’s most spectacular sites. Petra, the "rose-red city half as old as time," is a hidden stronghold filled with magnificent tombs and buildings hewn out of the valley’s stone cliffs. Petra became the capital of the Nabatean empire, and it flourished for many years as a trading center. When the Nabatean empire came under the control of the Romans, the Arabian capital moved from Petra to Bostra, and Petra lost much of its importance. During the Byzantine era, Petra was a bishopric, but the city was abandoned after the Byzantine empire lost its power. Nearby crusader forts indicate that Petra was an important stop on 12^th century caravan routes, but with the decline of the crusaders Petra became lost to the western world until its rediscovery by the Swiss explorer Burckhardt in the early 19^th century.