The Golden Age began with the reign of David IV ("the builder" or "the great"), the son of George II and Queen Helena, who assumed the throne at the age of 16 in a period of Great Turkish Invasions. As he came of age under the guidance of his court minister, George of Chqondidi, David IV suppressed dissent of feudal lords and centralized the power in his hands to effectively deal with foreign threats. In 1121, he decisively defeated much larger Turkish armies during the Battle of Didgori, with fleeing Seljuq Turks being run down by pursuing Georgian cavalry for several days. A huge amount of booty and prisoners were captured by David's army, which had also secured Tbilisi and inaugurated a new era of revival.