One of the examples showing that it is the retelling of the Sphinx myth like heroes in both the stories have to answer the riddle correctly to continue with their quests.
<u>Explanation:</u>
The grey king is one of the contemporary fantasies novels which has been written by Susan Cooper. This was published in the year 1975.
In this novel, the grey king who is also known as the Brenin Llwyd is the evil lord who is opposing the light. The king is known as the strongest, most powerful and the oldest of the lords of the dark. But despite all these powers, he has some limitations like he can not break the laws of the high magic.
