Unofficial Name The name of this article wasn't revealed in the novel and instead was given by editors of the wiki as substitute for lack thereof.
He was the previous Sect Master of the
Cleansing Incense Ancient Sect.
Around 1600 years ago he and his eldest disciple
Gu Tieshou came to visit Liu San Jian. Soon after, Liu San Jian sent Tu Bu Yu to find Min Ren's descendants.
Eventually, close to the start of the
Current Era, Tu Bu Yu found the Heaven's Edge's Su Clan and brought Su Yonghuang from it.
At that time
Gu Tieshou had the biggest chance to become the next Sect Master, but Liu San Jian appointed Su Yonghuang instead. 
The Previous Sect Master then summoned
Gu Tieshou and entrusted him to help Su Yonghuang take charge of the Sect. Gu Tieshou was displeased with this decision, but still followed the orders of his master and supressed all opposition and supported Su Yonghuang. 
According to rumors,
Old Devil is his bastard. Before his death Previous Sect Master asked Su Yonghuang to take care of Old Devil.
Previous Sect Master died some time after
Su Yonghuang became a new sect master.  
Links 3 Mention(s) of Sect Master (Cleansing Incense Ancient Sect) (Generation Ago)