Gnam-ri-srong-brtsan (born c. 570—died c. 619) was a descendant of a line of rulers of Yarlong, who united tribes in central and southern Tibet that became known to China’s Sui dynasty (581–618). After his assassination, he was succeeded by his son, Srong-brtsan-sgam-po (c. 608–650), who continued his father’s military expansion and established his capital at Lhasa. Srong-brtsan-sgam-po became so powerful that the Tang dynasty (618–907) entered into a marriage alliance with him in 641.