李常傑
Nam quốc sơn hà (, ) is a famous 11th-century Vietnamese poem. Dubbed "Vietnam's first Declaration of Independence", it asserts the sovereignty of Vietnam's rulers over its lands. The poem was first dictated to be read aloud before and during battles to boost troop morale when Vietnam under Lý Thường Kiệt fought against the first invasion of the Song dynasty in 1075–1076, though its exact authorship is still controversial.