Luo Hongxin was from Guixiang (貴鄉), one of the two counties making up the main city of Weibo Circuit's capital Wei Prefecture (魏州).
Luo Hongxin himself did so as well from his youth, and he successively served under the military governors Han Jian and Le Yanzhen.
However, when Le Congxun subsequently tried to fight out of the siege, Luo's officer Cheng Gongxin (程公信) attacked and killed him.
Subsequently, Le Yanzhen was also executed, and both his head and his son's were publicly displayed on the gate to the Weibo camp.
[2] Later in 888, Emperor Zhaozong made Luo Hongxin full military governor of Weibo,[2] and created him the Duke of Yuzhang in 889.
Emperor Zhaozong also bestowed on him the honorary titles of acting Sikong (司空, one of the Three Excellencies) and chancellor (同中書門下平章事, Tong Zhongshu Menxia Pingzhangshi).
[5] In 898, Zhu Quanzhong, with aid from Weibo, attacked the three prefectures of Zhaoyi Circuit east of the Taihang Mountains that Li Keyong still held.
The Xuanwu/Weibo troops quickly achieved victory and captured those prefectures, removing Li Keyong's remaining military presence east of the Taihang.
The Weibo soldiers supported his son Luo Shaowei as acting military governor, and this was later confirmed by Emperor Zhaozong.