* The Egyptian sun god Ra: In this case, we'd be talking about mythology and religious stories, not necessarily a specific literary work.
* A specific work of literature: There are many stories, poems, and even songs titled "Ra," and each might be considered a masterpiece in its own way.
Please tell me:
* What kind of "Ra" are you referring to?
* What makes you think it might be a masterpiece?
Once I have this information, I can help you analyze the qualities that make a masterpiece and see how they apply to your specific example.