Mr J.L. Mott, a retired Danish sea captain, provided the world with some amusement, before World War II, when he established the Empire of Atlantis and Lemuria on Thore (Atlantis), a small island in the Bahamas, together with a few islands in the Pacific (Lemuria). He produced his own banknotes and distinctive triangular stamps as well as an Atlantean flag. I wonder what Plato would have said! It seems that Mott also claimed to be a descendant of Leif Erikson.
A 1953 newspaper report(d) adds a few further details regarding Mott and his disappearance in 1934. Egerton Sykes appears to have unsuccessfully sought any additional information.
Recently I came across a site(a) which recounts the Mott story but adds an image and text where it refers to C. L. Matt!
Another site(c) also tells the Mott story, including his disappearance, this time, in 1940.