So, I'm new to the site... not at all new to the games. I've been playing since I was born. I started with 7 and have now made my way through the entire series except for Thracia 776 (for the love of God please link me a working patch). Okay, introductory note aside, I've been doing some thinking. Recently I was listening to Echoes's amazing soundtrack. When I reached the song 'Prince of Darkness', something hit me...
So, we know that Fire Emblems 1/11, 2/Echoes, 3/12, 4, 5, and 13 are all part of the Archanea Timeline. So, certain demons and monsters such as both Loptyr and Duma exist in the same world. Julius was always referred to as the Dark Prince, while Berkut was referred to (through the soundtrack) as the Prince of Darkness. Let's also not forget that when Julius was killed in Genealogy, he morphed into a dragon before he finally bit the dust. So, and I mean to say this is just a thought, is it possible that Duma (having taken the form of a dragon before) is the same Loptyr that Jugdral came to fear? They even both utilize similar fighters on the final levels in their respective games: the Deadlords and the Duma Faithful. Along with that, we learn in Genealogy that Loptyr once ruled some sort of Dark Empire, sounding extremely similar to the land Duma was ruled with an iron fist.
I'm not saying this has to be the truth, but please use your complete knowledge of the series and really get some good insight into the evidence that supports this. If anybody has some other evidence supporting it or something to put it down, please make a post. Seeya fellahs!