Didn't the Qing dynasty say that the emperor was the emperor? Why did Qianlong make May 15th emperor?

He used to want his first son to be a prince.

At first, Li Yonglian, a veritable eldest son, died young before he was ten years old. ...

Later, Yong Cong was founded, and he was the eldest son. This time, he died earlier, only two years old. ...

After Yong Cong's death, Yong Lian and Yong Cong's biological mothers died one after another, followed by the eldest son.

After Qianlong, he became a queen, but he didn't have a son, so it was impossible to choose his own son or eldest son as a prince.

After Qianlong wanted to make the third son a prince, and the third son died; Trying to make Wu Zixu a prince, Wu Zixu died,

By the time Qianlong was sixty-three, there were only six princes left, two of whom were adopted by others, leaving only four: eight sons of Emperor Yongxuan, eleven sons of Emperor Yongxuan, fifteen sons of Yan Yong and seventeen sons of Yan Yong.

Yazi is always mysterious and extremely clever, and he is the eldest son of today, but he has no organization and discipline and does whatever he wants; There is also a disease in the foot; When he prayed for rain, he had more personality. He begged for a while, and when it stopped raining, he took his sleeves and left. ...

Eleven sons, the great calligrapher Yong Xun, wrote an inscription on the immortal tablet in front of the Qianlong Mausoleum, but this man was infected with too many Han habits, almost without Manchu martial spirit, very unpopular and stingy. He saved hundreds of thousands of taels of silver but led his family to drink porridge.

Seventeen-year-old Lin Yong: I was only eight years old when I founded the bank. I don't like studying and I don't want to recruit people.

After elimination, only the old fifteen remained, and Gan Long could not choose him.