Empress Dowager Ci'an
Zaitian was the second son of Yixuan (Prince Chun), and his primary spouse Yehenara Wanzhen, a younger sister of Empress Dowager Cixi. On 12 January 1875, Zaitian's cousin, the Tongzhi Emperor, died without a son to succeed him. Breaking the imperial convention that a new emperor must always be of a generation after that of the previous emperor, candidates were considered from the generation of the Tongzhi Emperor. Empress Dowager Ci'an suggested choosing one of Prince Gong's sons to be the next emperor, but was overruled by her co-regent, Empress Dowager Cixi. Instead, Cixi nominated Zaitian (her nephew) and the imperial clan eventually agreed with her choice because Zaitian was younger than other adoptable children of the same generation.