Prince of Qin () was a first-rank princely peerage of the Ming dynasty. The princedom was created by the Hongwu Emperor for his second son, Zhu Shuang.
Generation names / poem.
The generation poem given by Hongwu Emperor was:
The mainline members used the poem until the name "Cun" (存), which was the same generation as Tianqi Emperor and Chongzhen Emperor.
Princedom of Qin.
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Cadet princedoms.
The princedom of Qin has 20 cadet branches, four of these cadet princedoms' designation are unknown, and nine of these principalities had merged after the title holders succeeded the main line's princedom.
The princedom that has merged included:
While there were another two princedoms with unknown designation, both of them made from some year during Tianqi Emperor's reign persons who held them were:
Princedom of Yongxing Comm..
Prince of Yongxing Commandery (永興郡王) was created in 1403 for Zhu Shanglie, the second son of Zhu Shuang, 1st Prince of Qin. The title was abolished in 1573 by the Ming court and headed by the senior-most members. The princedom was located at Gongchang (), Shaanxi.
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Princedom of Bao'an Comm..
Prince of Bao'an Commandery (保安郡王) was created in 1403, for Zhu Shangyu, third son of Zhu Shuang, the 1st Prince of Qin. The title was abolished in 1554 by the Ming court. The princedom was initially located in Lintao (臨洮), Shaanxi, then changed to Xi'an.
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Princedom of Xingping Comm..
Prince of Xingping Commandery (興平郡王) was created in 1402, for Zhu Shangzhou, fourth son of Zhu Shuang, the 1st Prince of Qin. The princedom extinct in 1476 after the last prince died childlessly.
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Princedom of Yongshou Comm..
Prince of Yongshou Commandery (永壽郡王) was created in 1402, for Zhu Shanghong, fifth son of Zhu Shuang, the 1st Prince of Qin. The princedom was extinct in 1656, during the reign of Yongli Emperor of Southern Ming.
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Princedom of Anding Comm..
Prince of Anding Commandery (安定郡王) was created in 1402, for Zhu Shangkai, sixth son of Zhu Shuang, the 1st Prince of Qin. The princedom was abolished in 1419 by Yongle Emperor.
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Princedom of Yichuan Comm..
Prince of Yichuan Commandery (宜川郡王) was created in 1426, for Zhu Zhibao, fourth son of Zhu Shangbing, the 2nd Prince of Qin. The prinedom was originally abolished in 1522, then the clan was headed by lower-rank members from 1525. The title recreated again by the Southern Ming court until the extinction in 1652.
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Princedom of Lintong Comm..
Prince of Lintong Commandery (臨潼郡王) was created in 1426 for Zhu Gongming, the eldest son (secondary son) of Zhu Zhiqie, the 5th Prince of Qin. The princedom merged after the 3rd Prince of Lintong succeeded the princedom of Qin in 1500.
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Princedom of Heyang Comm..
Prince of Heyang Commandery (郃陽郡王) was created in 1426 for Zhu Gongtang, the fourth son of Zhu Zhiqie, the 5th Prince of Qin. The princedom was abolished in 1508 by the Ming court and headed by the senior-most members. 
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Princedom of Yanyang Comm..
Prince of Yanyang Commandery (汧陽郡王) was created in 1446 for Zhu Gongcheng, the fifth son of Zhu Zhiqie, the 5th Prince of Qin. The princedom became extinct in 1554.
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References.
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