The Warring States period was a time of transformation and conflict in Chinese history, and the "Four Gentlemen of the Warring States" were aristocratic figures who attracted much attention at that time. Among these gentlemen, some were born into royal families, but not all of them were members of the royal families.

1. Prince Xinling of Wei: Prince Xinling was a noble prince of the State of Wei, whose father was Wei Wuji, the younger brother of Wei Zhao Wang. Although Prince Xinling was not a member of the royal family, he possessed extremely high social status and wealth, and was also a talented cultural figure.

2. Prince Pingyuan of Zhao: Prince Pingyuan was a noble prince of the State of Zhao, whose father was Zhao Sheng, the eldest son of Zhao Wu Ling Wang. Although Prince Pingyuan was not a member of the royal family, he was an important politician and military general of Zhao, and had achieved remarkable military achievements in wars.

3. Prince Chunshen of Chu: Prince Chunshen was a noble prince of the State of Chu, whose father was Huang Xie, the favorite minister of Chu Huai Wang. Although Prince Chunshen was not a member of the royal family, he was an important politician and cultural figure of Chu, and had made outstanding contributions in the political and cultural fields.

4. Prince Tianwen of Qi: Prince Tianwen was a noble prince of the State of Qi, whose father was Tian Ying, the son of Qi Wei Wang. Although Prince Tianwen was not a member of the royal family, he was an important politician and military general of Qi, and had achieved remarkable military achievements in wars.

In summary, not all of the Four Gentlemen of the Warring States were members of the royal families, including Prince Xinling of Wei, Prince Pingyuan of Zhao, Prince Chunshen of Chu, and Prince Tianwen of Qi. They each had different backgrounds and experiences, but all played important roles in society at that time.

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