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他是赤德鬆贊的兒子,赤祖德贊的哥哥(一說是弟弟)。在赤祖德贊死後繼位為西藏贊普。
《蒙古源流》:“汗(寅恪案,此指持鬆壘。)無子,其兄達爾瑪,癸未年所生,歲壬戌,年四十歲,即位。因其從前在世為象時,曾設惡願,二十四年之間,惡習相沿,遂傳稱為天生邪妄之郎達爾瑪。(寅恪案,藏語謂象為朗gl。)汗將大乘三藏以下,下乘以上之三乘及四項僧人,俱行殄滅,殘毀禪教。”
朗達瑪在位期間,對佛教采取禁絶措施,史稱“朗達瑪滅佛”,佛教徒視其為牛魔王再世,故稱其為“朗達瑪”(“朗”意為牛)。842年,朗達瑪被佛教僧人拉隆·貝吉多傑刺殺。其死後,俄鬆、乞離鬍二子相互爭位,吐蕃分裂。
During the reign of Lang Darma, to ban measures of Buddhism, known to history as "Lang Darma suppression of Buddhism," Buddhist view them as the reincarnation of Bull Demon King, so called, "Lang Darma" ("Long" means cattle). 842 years, Buddhist monks 拉隆贝吉多杰 Lang Darma was assassinated. His death, Russian Song, Qi Hu Erzi from each other vying for positions, Tibetan separatism.