The commentary to the Yuanjue jing in Old Uigur, which was published by Kudara (1992) and Zhang - Zieme (2012), includes unique teachings and quotations ascribed to the Great Master SYLW, whose name apparently derives from a Chinese honorific title for eminent Buddhist monks, which has remained unidentified so far. This paper examines the nature of this commentary by tracing the Great Master SYLW in Chinese Buddhist texts.