Why did both the Tang Dynasty and the Ottoman Empire imprison their heirs in the later period?

Why did both the Tang Dynasty and the Ottoman Empire imprison their heirs in the later period?
In the history of the world, the inheritance system is varied, but when it comes to the inheritance system, it is rarely the only one-all the princes except the heir to the throne should be executed.

in the history of the world, the inheritance system is varied, but if there is such a provision in the inheritance system, it is estimated that this is the only family-all the princes except the heir to the throne should be put to death.

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