If the emperors of feudal history were to get together and gather together, it is estimated that the emperors of the Southern and Northern Dynasties would be the most unpopular.
Why?
There are few times in history where tyrants have emerged like the Southern and Northern Dynasties, and 70% of the rulers of this period are emperors, and half of the monarchs are tyrants.

In 464, Emperor Xiaowu of the Southern Dynasty died, and Liu Ziye succeeded to the throne with the era name "Yongguang".
Like other bastard emperors during the Southern and Northern Dynasties, Liu Ziye was an uncompromising asshole. His behavior was comparable to that of the Northern Qi Gao yang and the like.
There is only one word in the Yongguang Emperor's dictionary: Kill!
The minister does not listen to himself? kill!
The minister failed to complete the task? kill!
Killing and killing, every day the minister had to look in the mirror before going to work, maybe today after going up to the front, it will say goodbye to the body.
Tyrants mostly like beauty, and Liu Ziye is no exception.
However, unlike those emperors who gave beauty gold and silver jewelry at every turn, the way he chased after beauty was: kill!
Dare not sleep with yourself? kill!
Dare to gossip in the harem? kill!
Idle, Liu Ziye also likes to let the women in the harem play naked and watch the "Living Spring Palace" by themselves. Because of his obscenity, no woman dared to say half a "no" word.
You must know that the Yongguang Emperor was only seventeen years old when he died, and these things were done when he was a minor.
It can be said that in the dictionary of the Yongguang Emperor, there is no word "family affection" at all. No, he sent a team of guards to "invite" the three uncles and uncles in the clan room and let them accompany him to "play games." ”
These three unlucky eggs were the King of Jian'an, the King of Shanyang and the King of Xiangdong. According to the arrangement of the Yongguang Emperor, the three of them stood on the scale of weighing the animals and weighed them in turn. The Yongguang Emperor felt that these three elders ate too much fat meat on weekdays, and they were wide and fat, and wanted to choose the fattest one for fun.
Liu Yu, the heaviest king of Xiangdong, was unfortunately elected "Pig King". Originally, Liu Yu thought that this was a joke of his nephew, but he did not expect that Liu Ziye solemnly issued an edict and gave the title of "Pig King" to his uncle. With this big fat pig by his side, Liu Ziye was happy and broken. He had people dig a large earth pit in the palace, fill it with water, and then ordered the "Pig King" to jump into the "Cosplay" fat pig.
Playing with the little emperor, but doing this kind of undignified thing is inevitably a bit excessive, and Liu Yu is more embarrassed. Liu Ziye saw the situation and hurriedly ordered someone to help his uncle. The guards stripped poor Liu Yu naked and threw him into a puddle. That night, Liu Ziye also arranged for someone to prepare a hearty meal for his uncle- a pot of pig food. The palace people took a large wooden basin, poured rice porridge and leftover vegetables into it, stirred well and sent to the puddle.
Even, in order to achieve a more realistic effect, Liu Ziye also let his uncle lie on the ground and lick food with his mouth. Liu Yu smiled and lay on the ground like a real pig. What Liu Yuwan did not expect was that the emperor's nephew was addicted to playing and really wanted to "eat pork". On this day, he was sleeping in a puddle when suddenly a few strong palace people came, tied his hands and feet tightly, and carried him to the imperial dining room. Liu Yu asked inexplicably, "What is this going to do?" The palace man's answer made him shudder: "Shengshang wants to eat pork today." ”
When Liu Yu's brother-in-law King Shanyang heard about this, he immediately ran to the emperor to intercede. The King of Shanyang was a wise man, and when the emperor played Liu Yu to death, it was his turn, which was called the cold of the lips and teeth. Of course, to persuade such a ridiculous emperor, it is natural to use strange reasons: "I said the emperor's nephew, you see this pig fat and strong, it must be delicious to eat." However, today is not the New Year's Festival, and it is a bit wasteful for such a good pig to kill and eat meat. You see that the little prince was born immediately, and on the day the prince was born, we would kill a pig and then eat a meal of fresh meat? ”
The Yongguang Emperor felt that his uncle was right, so he ordered someone to carry Liu Yu back to the puddle to serve him, but he could not be hungry and thin.
After some time, the concubine of the Yongguang Emperor gave birth to a prince. Perhaps with a son, the Yongguang Emperor was too happy, so he released the "fat pig" Liu Yu and did not really kill him to eat meat.
However, this experience made Liu Yu feel evil. He also understood that as long as the emperor's nephew did not die, sooner or later he would have to be treated like a fat pig and a fat sheep. Instead of that, take your nephew and take his place!
In order to trick his nephew into taking the bait, Liu Yu bribed the fangshi and asked them to go to the palace to deceive Liu Ziye that the Bamboo Forest Hall was haunted. The word "ghost" successfully aroused Liu Ziye's interest, and he immediately came to the Bamboo Forest Hall to "catch ghosts". Unexpectedly, what awaited him was the killer arranged by uncle "Pig King" here.
In the end, Liu Ziye's life was screaming, and Liu Yu naturally sat on the dragon chair in the crowd.
The common people thought that the good days had come, but they did not expect that this "pig king" uncle was no different from his nephew. After Liu Yu came to power, he launched a great purge in the middle of the dynasty, and learned from his nephew and began to make a fortune in the palace.
In ancient times, there were very few long-lived people, and Liu Yuzi was no exception. Within a few years of indulging in alcohol, Liu Yu was hollowed out and died at the age of thirty-three.
Resources:
【History of the Southern and Northern Dynasties of Wei and Jin" and "Zizhi Tongjian"]