Dìngróng

Dingrong was a fortified place west of Mizhi in the northern Shaanxi hills. Known also as Kerong, it belonged to the Suide military district during the struggles between Song and Western Xia. The Jin took the fort in 1128 and later made Dingrong a county. Mongol armies captured the district in the thirteenth century, and in 1267 the Yuan incorporated Dingrong into neighbouring Mizhi. Its changing status reflects the frontier's movement across these valleys and ridges.