《西遊記》第三十六回至三十九回的「烏雞國」故事，大約是在吳承恩去世後的一二十年內由另外的作者創寫插入的。筆者懷疑，這一「西域故事」素材來自十六世紀流傳於歐洲大陸的丹麥王子故事。十六世紀八十年代進入中國的西方耶穌會士利瑪竇，很可能是這一域外傳說的傳播者。「烏雞國」故事中還留有與基督教信仰相關的某些痕跡，可為這一判斷提供佐證。《西遊記》對丹麥王子故事的吸納，早於莎士比亞《哈姆雷特》。這一故事的插入，使帶者「三教合一」色彩的《西遊記》，具有更廣泛的文化代表性。

　　　　　It is doubted that the episode of Wuji kingdom in chapters 36-39 of A Pilgrimage to the West might probably be written and added in that book by an unknown author 20 years after the death of Wu Cheng-en. It is indicated that the content of this Western Region episode originated from the legend of the Prince of Denmark that widely spread in European continent : Mathew Ricci, the first misisonary to China in the 1680s, might be the transmitter of this story. Some traces may still be seen in the episode of Wuji Kingdom about the beliefs of Christianity, which provides evidence for the above judgement Both A Pilgrimage to the West and Shakespeare's Hamlet absorbed the legend of the Prince of Denmark as literary material; the former was earlier than the latter. The involvement of the idea of "three religions in one," more representative of various cultures.