When Prester John’s letter appeared, Europe was embroiled in the Crusades.

当祭司长约翰的信出现时， 欧洲正卷入十字军东征。

And when a letter allegedly written by this so-called “Prester John” appeared, European rulers were thrilled.

当一封据称是这位所谓的“祭司约翰” 所写的信出现时，欧洲的统治者激动不已。

And second, to find the kingdom of Prester John, a mythical Christian King who was supposed to live in Africa somewhere, so that Henry could have Prester John’s help in a crusade.

其次，找到祭司约翰的王国，一位神话中的基督教国王， 他应该住在非洲的某个地方， 这样亨利就可以在十字军东征中得到祭司约翰的帮助。