"The Gift of Harun Al-Rashid" is Yeats`s epistolary autobiographic poem based on the mystic episodes about the Calif Harun Al-Rashid and his favorite subject Kusta Ben Luka, the diagrammatist from The Arabian Nights. Naturally, its background and style are unique and, in a sense, it is a blended fabric of vision and reality. It has been considered to be something of a mystery, having nothing to do with the ancient Irish pagan myths into which Yeats used to bore. In this poem Yeats reflects in the most thinnest way of disguise his happy marriage life with his young wife Georgie Hyde-Lees, and her talk in sleep and automatic writing through arbitrary modification of the mysterious stories about Kusta and his young ignorant wife in the earlier years of their marriage life. The main theme of this poem is to descry Yeats`s persona Kusta`s journey from dark ignorance to light understanding through his young wife`s mouth and the various geometric symbols that she draws on the sand of the desert in the full moon. And this poem is important in that it clues us in deciphering the meaning of Yeats`s visionary philosophical system A Vision.