Vis Uban, Ancient for "Place of Great Power" and designated P4T-3G6 by the Tau'ri, was the name of a city built by the Ancients in the Milky Way. According to notes of Dr. Daniel Jackson the city was intended to be the crown jewel of the Ancient domain in the Milky Way. However, a Plague soon broke out and the city was forced to be abandoned. If completed, it would have been more powerful than Atlantis. Based on this information, Jonas Quinn speculated that Vis Uban was the Lost City that Stargate Command was searching for, determining its Stargate address as the last on the list of new gates that Colonel Jack O'Neill entered into the gate map from the Ancients' Repository of knowledge. SG-1 led an expedition to search the ruins on the planet, where they located a deascended Daniel Jackson