Tang Wuzong (Li Yan) had five sons, but in the end he canonized the imperial uncle Li Fan and passed the throne to the thirteenth uncle Li Xuan. This series of decisions involved many aspects such as the politics of the time, family relations, and the personal considerations of Wu Zong himself.
First of all, Tang Wuzong's decision to ornate Li Fan, the emperor's uncle, may have been influenced by political considerations. In ancient dynasties, succession to the throne involved intrigue and power struggles. Perhaps in Tang Wuzong's eyes, he thought that the imperial uncle Li Fan was more helpful in consolidating his rule, perhaps because he had more supporters in the imperial court, or because he had a stronger military force. Such political considerations are often an important factor in the selection of an heir by a monarch.
Secondly, family relationships were also a factor influencing Tang Wuzong's decision. The internal relations of the royal family are complicated, and there are frequent battles for the throne. Perhaps Tang Wuzong thought that the imperial uncle Li Fan was easier to get support within the family, or that there was a way to maintain the unity of the family, so he chose him as the heir.
In addition, Wu Zong's personal preferences and opinions may also have an impact on the choice of heir. The thirteenth uncle, Li Xuan, may have had better political skills, leadership skills, or other virtues in the eyes of Tang Wuzong, and was therefore considered more suitable to inherit the throne. Or in Tang Wuzong's mind, the thirteenth uncle Li Xuan may be more favored and have closer feelings, so he will become the ideal heir in his mind.
Finally, the historical background and current situation may also have an impact on the choice of Tang Wuzong's successor. In the political environment at that time, there may have been some factors that forced Tang Wuzong to make this decision, such as external threats, internal strife, etc. Choosing a more suitable heir may be considered a more favorable decision to deal with the current situation.
On the whole, Tang Wuzong's canonization of the emperor's uncle Li Fan and passing the throne to the thirteenth uncle Li Xuan is a complex political decision, involving many factors such as politics, family relationships, and personal preferences. Such historical events often need to be interpreted at multiple levels to better understand the context and decision-making process at the time.