I feel like, there is a pattern in different works, divided wide both in terms of time and nationalities, ranging from Plato's "Republic" to Firdosi's "Shahnama" and Tolkien's "Lord of the Rings". Plato was living in a time, when the great ancient Greek city of Athens was in decline due to wars and greed of the Aristocrats. Firdosi was living in a time, when Persia was in decline and was losing territory and authority to Turks of Central Asia and Tolkien was living in previous century, the most deadliest century of all times so far. He participated in WWI and witnessed the rise of the Germany, WWII, decline of British Empire and rise of Soviet and American Empires. Republic, Shahnama and Lord of the Rings are works of fantasies but are so rich in imaginations that are more lively than real world. These masterpieces were intended to inspire, people of their times to stand upright in the face of declines caused by weaknesses of ruling men.
If you have watched or read the first of the Lord of the Ring series; "The Fellowship of the Ring", you might have noticed it all over the story but particularly in the dialogue between Boromir (The Captain of the White Tower; from Gandor) and Aragorn;
Boromir; I will find no rest here. I heard her voice
(Lady of Light) inside my head. She spoke of my father and "fall of Gandor". She said to me; "Even now, there is hope left". But I cannot see it. It is long since we had hope. My father is a noble man but his rule is failing..... and our people lose faith. He looks to me to make things right, and I would do it.
"I would see the glory of Gandor restored".
Have you seen it, Aragorn? The white tower of Ecthelion, glimmering like a spike of pearl and silver. Its banners caught high in the morning breeze. Have you ever been called home....by the clear ringing of silver trumpets?
Aragorn; I have seen the white city long ago....
Boromir; One day, our paths will lead us there. And the tower guard shall take up the call; "The Lords of
Gandor have returned"
Reading these lines of the Tolkien, I was feeling that he is speaking about fall of British Empire and is expressing hope for a come back of her glorious times. The reason is just the historical perspective behind this novel. Although there is an alliance of different races and creatures (Just like WWII scenario) against Sauron (a common threat) but each one is concerned with the glory of their own cities.