zhèng guāng zǔ
Zheng Guangzu, Yuan dynasty dramatist in the 雜劇|杂剧 tradition of musical comedy, one of the Four Great Yuan dramatists 元曲四大家
郑
zhèng
abbr. for Zhengzhou 鄭州|郑州[Zheng4 zhou1], the capital of Henan
光
guāng
light; ray (CL:道[dao4])
祖
zǔ
ancestor