This is a masterpiece of narrative poetry. It was one of the best-selling books of its day in England, and it's easy to see why. Thomas Moore was a man of learning and wit, and had an ear for smooth and melodious verse. He slaved over "Lalla Rookh" for years, carefully researching its stories and imagery, polishing and polishing the verse, pouring all his learning and philosophy into its pages.
It is a cycle of four oriental tales, contained in a broader frame tale. Lalla Rookh is a young indian princess, on the way to her wedding. On the way, the passionate and handsome young Fermaroz tells her four tales, while her puritanical chamberlain, Fadladeen, criticises them for their energy and religious heterodoxy. The tales are told in a variety of poetic forms: "The Veiled Prophet" is written in heroic couplets, while the others are all written in a mixture of metres, and include a number of lovely songs and lyrics.
The main themes of the stories are love, religion and idealism. Every page breathes the spirit of Moore's tolerance and sympathy. Two main arguments emerge as the stories unfold: people require an ideal, whether romantic, religious, or political, to give order and meaning to their lives; and since people serve different ideals, we need to be open, and tolerant of others' faiths. Both "The Veiled Prophet" and "The Fire-Worshippers" describe religious wars, and it is not hard to see both as allegories for Thomas Moore's own dear Ireland, whose subjugation and depredations Moore deeply deplored.
The great critic William Hazlitt dismissed this poem as finely polished but lacking depth. Two centuries later, I think we can revise this judgment. It is true that Moore's poem is extremely melodious, and is filled with extravagant, beautiful images culled from the writings of the great orientalists. But it is also true that Moore's psychological realism and philosophical acumen are nearly unprecedented in narrative verse. Moore borrows techniques of psychological description from the novelists of his day, for example, free indirect discourse; and his reflections on his characters' motivations and actions display a thorough knowledge of eighteenth-century philosophy of mind.
If the book has one flaw, it is that its tone does not vary much, and indeed is clichéd. This is the magical, mystical, tragical, tyrannical world of the Orient, where all lovers are doomed and everyone is either a poet or a religious maniac. But the other beauties of the book outweigh this flaw, and it remains an engrossing and uplifting read from start to finish.