Accession of a Child Ruler and Su Hien Thanh's Regency in Dai Viet's Ly Dynasty (1175–1179)

Timeline

1. 1175Thang Long imperial city · VietnamLy Anh Tong (Ly Thien Thuc) fell gravely ill and died in 1175; three-year-old crown prince Ly Long Khanh (temple name Cao Tong) succeeded. Grand Commandant Su Hien Thanh, entrusted by the late emperor, took the regency and refused Empress Dowager Chieu Linh's request to replace him with deposed crown prince Ly Long Truong, stabilizing the succession. Do Anh Vu was Ly Anh Tong's early-period powerful minister, dying around 1158, unrelated to this accession.
2. 1179Thang Long · VietnamSu Hien Thanh died of illness in 1179 (commonly dated September 23); on his deathbed he recommended Chen Trong Thay to the empress dowager as his successor, but she refused and instead appointed Du An Nhi and others as regents. Later Cao Tong came of age and ruled personally; court politics grew increasingly extravagant and chaotic, Ly central authority weakened, and the dynasty was finally replaced by the Tran dynasty in 1225.