Short answers, pulled from the story.
The Kangxi Emperor was born on the 4th of May 1654 and died on the 20th of December 1722. He reigned from 1661 to 1722, making him the longest-reigning emperor in Chinese history with a total duration of 61 years.
The Kangxi Emperor orchestrated a coup in the spring of 1669 to arrest Oboi and end the regency. He acted with the help of his grandmother, Grand Empress Dowager Zhaosheng, to seize personal rule after six years of being a puppet.
The Three Feudatories Rebellion was a conflict involving Wu Sangui, Geng Jingzhong, and Shang Zhixin that began in 1673 when the Kangxi Emperor revoked their fiefdoms. The war lasted eight years and ended in 1681 with a Qing victory.
The Kangxi Emperor defeated the Dzungar Mongols at the Battle of Ulan Butung in 1690 and the Battle of Jao Modo in 1696 and 1697. He also defeated the Kingdom of Tungning in 1683, bringing Taiwan into the Qing Empire under the command of Admiral Shi Lang.
The Kangxi Emperor banned Christian missions in 1715 after Pope Clement XI issued the papal bull Ex illa die condemning Chinese rites. The emperor refused to allow the Pope's representative to oversee missionary activities and declared the missions to be causing trouble.
The fourth prince, Yinzhen, succeeded the Kangxi Emperor after his death on the 20th of December 1722. The succession crisis involved a struggle known as the Nine Lords' War where various princes formed factions to support their claims to the throne.