Who are Liu Yuxi and collectively called the three masters?

Bai Juyi, Wei Wu Ying. According to Liu Yuxi's deeds, in the Tang Dynasty, Suzhou people were full of gratitude and love for Liu Yuxi, so they called Bai Juyi, Wei Wuying and Liu Yuxi "three sages" and established the Three Sages Hall. Liu Yuxi, born in Luoyang in Pengcheng, China in the Tang Dynasty, was a writer and philosopher in the Tang Dynasty.