七国之乱
Emperor Wen, during the early part of his reign, was often impressed with suggestions tendered by a young official, Jia Yi, but opposed by senior officials, he did not promote Jia to particularly high positions; rather, Jia was put into a rotation as a teacher for various princes. Jia proposed dividing the larger principalities ruled by branch lines of the imperial family, a proposal that Emperor Wen agreed with but hesitated to actually carry out, and he did not actually implement Jia's proposal, which later might have prevented the Rebellion of the Seven States.