理藩院
The Yongzheng Emperor continued to perceive Yinsi and his party, consisting of the princes Yintang, Yin'e, Yinti, and their associates, as his greatest political challenge in the early years of his reign. To diffuse their political clout, the Yongzheng Emperor undertook a 'divide and conquer' strategy. Immediately after ascending the throne, the emperor bestowed on Yinsi the title "Prince Lian", nominally of the highest noble rank. Yinsi was also then appointed as the Minister of the "Lifan Yuan" (Feudatory Affairs Office) and the top-ranking member of the imperial council assisting the Yongzheng Emperor; some historians believe his position at the time was essentially that of a "Chancellor or Prime Minister". By ostensibly elevating Yinsi to a more prominent political role, the Yongzheng Emperor held Yinsi under close watch and kept him busy with affairs of state, reducing the chance of him conducting behind-the-scenes political maneuvers. Yinsi's allies received notably different treatment. Yintang was sent to Qinghai under the pretext of military service, but in reality was watched over by the Yongzheng Emperor's trusted protégé, Nian Gengyao. Yin'e, the tenth prince, was told to leave the capital to send off a departing Mongol prince, but since he refused to complete this trip as the emperor commanded, the Yongzheng Emperor stripped him of all his titles in May 1724 and sent him north to Shunyi to languish in solitude.