Riose got his chance when he heard rumors of the "magicians" from Ducem Barr and others, in reference to the scientists of the Foundation. At this time, the Foundation held a large portion of the periphery in economic control and word of the Foundation was beginning to reach the Empire at the Galactic Core. As a stalwart and patriotic defender of the original Galactic Empire, Riose was shocked by the legend of Hari Seldon's plan to create a new Empire which would take over from his own; the Foundation was a real threat. With several of the last great "ships of the line", pinnacles of Imperial technological and military prowess (of which few remained in those degenerate times), Riose set out into the barbarian Galactic Periphery to claim the Foundation in the name of Empire and Emperor. Seldon had predicted that the Foundation would survive all trials, and Bel Riose knew this, but he bet his living will against the "dead hand" of Seldon's psychohistory. In combat, Riose repeatedly defeated the Foundation through brilliant tactical and strategic planning. Eventually, Riose's fleet came within a day's travel of Terminus. Before he could complete his conquest, however, he was recalled by Emperor Cleon II, tried for treason, and executed.