King Jijung of Silla: Adoption of the Name 'Silla' and Annexation of Usanguk

In 503 King Jijung officially named the kingdom Silla and adopted the title 'king' in place of 'maripgan.' In 512 he dispatched Isabu to subjugate Usanguk (Ulleungdo). He also promoted ox-plowing, raising agricultural productivity.