In November 1386, King Bagrat was defeated and taken prisoner by the Mongol warlord Timur Leng. Prince George organized a successful resistance to the next incursion and released his father. In 1393, Bagrat died and George assumed full royal powers. He spent most of his reign fighting Timur who led seven more expeditions against the stubborn Georgian kingdom from 1387 to 1403, leaving the country in ruins. Finally, in 1403 George had to make peace with the fierce enemy, recognising Timur as a suzerain and paying him tribute, but retaining the right to be crowned as a Christian monarch. He was killed in battle against the Turkmen nomads, apparently of the Kara Koyunlu clan.