Duke Yansheng
Kublai Khan (r. 1260–1294) originally wanted to merge the two Duke Yanshengs under the southern one by making Kong Zhu (), the southern branch's leader, the legitimate successor to the Duke Yansheng line. However, since Kong Zhu declined the offer, Kublai Khan abolished the southern Duke Yansheng title and appointed Kong Zhu as the () of the Imperial Academy. Since then, the northern branch has remained as the "legitimate" heir to the Duke Yansheng line.