Luo Guanzhong, better known by his courtesy name Guanzhong (Mandarin pronunciation: [lwo kwanʈʂʊŋ]), and also known by his pseudonym Huhai Sanren (Chinese: 湖海散人; pinyin: Húhǎi Sǎnrén; 'Leisure Man of Lakes and Seas'), was a Chinese writer who lived during the Ming dynasty, with some sources suggesting he may have lived during the Yuan Dynasty. Luo is most renowned for his contribution to Chinese literature, being credited with writing Romance of the Three Kingdoms, one of the Four Great Classical Novels of Chinese literature. He is also believed to have assisted Shi Nai'an in drafting Water Margin, another masterpiece of Chinese classical literature, if Shi Nai'an existed and was not one of his pseudonyms.