Zheng Zhilong
In Fuzhou, the Prince of Tang was under the protection of Zheng Zhilong, a Chinese sea trader with exceptional organizational skills who had surrendered to the Ming in 1628 and recently been made an earl by the Hongguang emperor. Zheng Zhilong and his Japanese wife Tagawa Matsu had a son, Zheng Sen. The pretender, who was childless, adopted Zheng Zhilong's eldest son Zheng Sen, granted him the imperial surname, and gave him a new personal name: Chenggong. The name Koxinga is derived of his title "lord of the imperial surname" ("guóxìngyé").