Which prince's grave is Dashanzi's Wang Yefen?

Tomb of Prince Yong Bi and Qin of Heshuo in Qianlong period of Qing Dynasty. Hiroyuki, the fifth son of Sejong. In the eleventh year of Yongzheng, he was crowned Prince. Yong Bi, the second son of Hongzhou, and the prince for thirty years. Thirty-seven years, I am diligent. Hongzhou is Ganlong's younger brother. According to the inscription, Yong Bi is "good at etiquette and tends to be introverted." Yong-bi was named as a hereditary replacement of the prince who did not belong to the iron hat king. Wang Yefen covers a large area, including stone tablets, Wenhe River, stone bridge, Temple of Appreciation, Baoding and other buildings. And the county king Mianxun, Baylor Zairong and Zhen Guogong Pu Lian are also buried here. Wang Yefen's grave was stolen by warlords, but it was later destroyed. Now there is only one turtle monument, about 5 meters high and beautifully carved.