A Jurchen tribal leader named Nurhaci (r. 1616–26), starting with just a small tribe, rapidly gained control over all the Manchurian tribes. During the Japanese invasions of Joseon Korea in the 1590s, he offered to lead his tribes in support of the Ming and Joseon army. This offer was declined, but he was granted honorific Ming titles for his gesture. Recognizing the weakness of Ming authority north of their border, he united all of the adjacent northern tribes and consolidated power in the region surrounding his homeland as the Jurchen Jin dynasty had done previously. In 1610, he broke relations with the Ming court, and in 1618 demanded a tribute from them to redress "Seven Grievances".