After the death of the Kangxi Emperor in the winter of 1722, his fourth son, Prince Yong (雍親王), became the Yongzheng Emperor. In the later years of Kangxi's reign, Yongzheng and his brothers had fought, and there were rumours that he had usurped the throne – most of the rumours held that Yongzheng's brother Yingzhen (Kangxi's 14th son) was the real successor of the Kangxi Emperor, and that Yongzheng and his confidant Keduo Long had tampered with the Kangxi's testament on the night when Kangxi died, though there was little evidence for these charges. In fact, his father had trusted him with delicate political issues and discussed state policy with him. When Yongzheng came to power at the age of 45, he felt a sense of urgency about the problems that had accumulated in his father's later years, and he did not need instruction on how to exercise power. In the words of one recent historian, he was "severe, suspicious, and jealous, but extremely capable and resourceful", and in the words of another, he turned out to be an "early modern state-maker of the first order".