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^James Anderson -The Rebel Den of Nùng Trí Cao: Loyalty and Identity Along ... 2007 - Page 129 "In 1059, the Ly court made an additional effort to take direct control of its frontier and the local manpower. The court divided the northern frontier in the Left and Right rivers region into the new administrative units Ngu Long, Vu Thang, Long Duc, Than Dien, Bong Thanh, Bảo Thắng (Bảo Thắng county, in modern-day Lào Cai province), Hung Lugc, and Van Tiep.35 To each of these units the court assigned ..."