Task: Question Generation
Input (English): Passage: Shang Zhixin was forced to commit suicide in 1680; of his thirty six brothers four were executed when he committed suicide while the rest of his family was allowed to live. Geng Jingzhong was executed; his brother Geng Juzhong 耿聚忠 was in Beijing with the Qing court with the Kangxi Emperor during the rebellion and was not punished for his brother's revolt. Geng Juzhong died of natural causes in 1687. Several Ming princes had accompanied Koxinga to Taiwan in 1661-1662, including the Prince of Ningjing Zhu Shugui and Prince Zhu Honghuan , son of Zhu Yihai. The Qing sent the 17 Ming princes still living on Taiwan back to mainland China where they spent the rest of their lives in exile since their lives were spared from execution. In 1685, the Qing used former Ming loyalist Han Chinese naval specialists who had served under the Zheng family in Taiwan in the siege of Albazin. Former Ming loyalist Han Chinese troops who had served under Zheng Chenggong and who specialized at fighting with rattan shields and swords  藤牌营 were recommended to the Kangxi Emperor to reinforce Albazin against the Russians. Kangxi was impressed by a demonstration of their techniques and ordered 500 of them to defend Albazin, under Ho Yu, a former Koxinga follower, and Lin Hsing-chu, a former General of Wu Sangui. These rattan shield troops did not suffer a single casualty when they defeated and cut down Russian forces traveling by rafts on the river, only using the rattan shields and swords while fighting naked.
Output (English): How many years after Shange Zhixin committed suicide did Geng Juzhong die of natural causes?