There's a truly captivating story behind all this that I'm still unraveling.
We know that Luman Walters studied in Paris in the early 1800s. Like other Americans studying in Paris at that time (Jonas King for example), Walters would have become familiar with the writings of a well-known Orientalist named Antoine Isaac Silvestre de Sacy. De Sacy was one of the first linguists to crack open pieces of.the Rosetta Stone. Professor de Sacy also acted as mentor for two students who went on to decipher the Rosetta Stone, Åkerblad and Champollion. Through his research into the history of Arab relations in Egypt, de Sacy encountered references in Arabic geographies to a people called the Kumr, he wrote about them in his French translation of an Arabic text published as "Relation de l'Egypte" (source). As I've discussed in previous posts, the Kumr were a Biblical clan descended from Japheth. They were the ancestors of the Polynesians and had originally built a city called Komoriyya on a large island called Komr. According to Arabic historians, in the first centuries AD, the Kumr launched raids against Aden on the Arabian Peninsula and established settlements in Egypt and Ethiopia where they gave their name to the well-known Gibbel-al-Komr and the Gibbel-al-Kamar, or Mountains of the Moon. (source)
Imagine that, ancient Polynesian marines launching navel strikes from their forts on the Arabian Peninsula against Ethiopians to gain control of a mountain called Komoriyya. BYP, how's that for a youtube video?
These Mountains of the Moon, named after the Kumr clan, were said to be the source of the Nile River and became a sort of centerpiece for Enochian and Hermetic lore. Surprisingly, James Bruce on his search for the mystical Mountain of Komoriyya, discovered not only the first, but the first three, copies of the Book of Enoch.
in my opinion the Book of Mormon is a historical fiction describing a group of Morians, or Egyptian Ethiopians (source), known as the Kumr, and their adventures with a sealed book of hermetic secrets on the island of Komoriyya. My hot take is that the toponym Moriancumr in the Book of Mormon is a portmanteau including Morian (an 18th century term for Ethiopians and/or Indians) + Kumr (a grandson of Noah who sailed with his family to a land called Komoriyya in boats modelled after Noah's ark. Ether 6:7 reminds us that the Jaredites modeled their boats after Noah's ark.
If there's interest, I can go into more detail about how the internal map of the Book of Mormon matches the geography of the ancient kingdom of Komoriyya with unmistakable precision. I could also go into more detail about how the historical founder of Komoriyya (named Maroni) ends up standing watch over a set of Golden Plates buried in a hill called Cumorah in New York.