《史记·三十世家·郑世家》
四年的春季，郑国担心晋国来包围，公子如便立成公的哥哥做国君。
四年春，郑患晋围，公子如乃立成公庶兄繻为君。
In the spring of 564 BCE, Zheng was worried that Jin would come to besiege it, so Duke Ru set up Cheng's older brother Ji as the monarch.