You do realise that only under Glyndwr did Wales unite , as nobody conquered Wales as such because It was Welsh region v Welsh region . All English kings would do is hire gwynedd to fight powys etc alongside his troops , as Welsh in fighting was fierce as still is today to certain degree.. if want to know about proper Welsh history , Owain Lawgoch was only man england really feared . Plus William Wallace , ( braveheart ) and St Patrick are both Welsh .
“Best selling novel” and “most famous poem” are questions for TV gameshows rather than a proper quiz site. Surely actual knowledge of the book itself, the author, the plot or even the characters is better than knowing which one coined iin the most cash. The latter question is almost entirely subjective.