 In East Asia, the Lateral succession system is first recorded in the pre-historical period starting with the late Shang Dynasty's Wai Bing succeeding his brother Da Ding, and then in connection with a conquest by the Zhou of the Yin Shang, when Wu Ding was succeeded by his brother Zu Geng in 1189 BC and then by another brother Zu Jia in 1178 BC.A drawback of the lateral succession is that, while ensuring a most competent leadership for the moment, the system inherently created derelict prince lines not eligible for succession.Any scion of an eligible heir that did not live long enough to ascend to the throne was cast aside as not eligible, creating a pool of discontented pretenders called "Tegin" in Turkic and "Izgoi" in Rus dynastic lines.