Hunt for treasure yields many artifacts in river

Zhang, a native of today's Shaanxi province, led a farmers' revolt, capturing Chengdu, the capital, and declaring himself emperor of the Daxi Kingdom in 1644.

He was forced to flee the city two years later and was ultimately defeated and killed by troops of the Qing Dynasty (1644-1911) from Northeast China, after he and his men were ambushed in Jiangkou by Yang Zhan, a Ming general, who set the rebels' boats on fire.