Tride Tsugtsen
khri lde gtsug brtan / mes ag tshom (680-743)
Tride Tsugtsen, also known as Mes-Agtshom, a seven year old boy, succeeded his father. His grandmother, Trimalo, acted as Regent. Three famous temples - Drakmar Drinzang, Chimpu Namral and Drakma Keru - were constructed to the south of Lhasa during his reign. Tsugtsen married Chin-ch'eng, a daughter of a Chinese prince in 710. It was intended to smoothen relationship between Tibet and China but the attempt unfortunately failed.
In 741 the princess Chin-ch'eng Kung-chu died and the Tibetan king sent an envoy to convey the news to the Chinese emperor and at the same time expressed his desire for negotiation for peace. On the emperor’s refusal the king attacked Ch'eng-feng and marched ahead. But his advance was halted by Gen Sheng Hsi Yeh at the Cha'ang-ning bridge. Later the Tibetans captured the town of Shih-p'u and occupied it till 748. In 755 king Mes-Agtshom was killed by his ministers Bal Dongtsep and Langme Zig.
Mes-Agstom's son Trisong Detsen succeeded him the same year.
Source: http://www.tpprc.org