One obvious reason not to believe it's authenticity is the paper. The paper used to write the book was at most twenty years old, which was intentionally made to look older. If the book was really copied for generations, than it obviously would have made sense to mention that and that new paper was used instead of making it intentionally look older.
Also, paper was very expensive prior to when the book was written. It wouldn't have been copied that much and if it would truly been deemed that important, it wouldn't have remained in private possession for such a long time and the story would have been at least as much copied and be at least as well known as Jewish mythology was.
Aside from the paper, there are many other reasons to believe that Thet Oera Linda Bok is a forgery. First is linguistics. Old Frisian was well known among Frisian scholars and there would definitely have been people who would have been able to write an extensive narrative in an Old Frisian-ish language or even a plausible precursor of it. François HaverSchmidt definitely would have known that Greece was called Kreklond in Old Frisian, just to name something. I haven't read Thet Oera Linda Bok, but where it clearly goes wrong is when modern Frisian like inventions are used when the authors didn't know an Old Frisian word. These examples are made to look old, but clearly look very modern. I'm greatly interested in Frisian history and linguistics and I've read quite some Old Frisian texts, but Thet Oera Linda Bok is simply too easy to read for a modern Frisian like me.
Thirdly, a great part of Frisian history is a forgery and a big part of Frisian history was invented during the late 19th, early 20th century. I.e. it was very common for Frisians to colour (I will come back to that later, because not all is fake) their history. Frisians are proud people and if nobody can refute their claims, it quickly finds its way in history books. For example, many Frisians will believe that the Frisian flag is hundreds of years old, the flag dates from the late 19th century. It is true that the flag is based on much older Frisian and Germanic heraldry. For once, compare the coat of arms and flag of Frisia to the coat of arms of Denmark. The symbols on the Frisian flag probably have the same ancient origins as the French Fleur-de-Lis. In reality the Frisian flag is a rather modern invention.
Also, many Frisians believe that the Frisian language is very old, preceding many other modern languages (this is even claimed in the Frisian anthem). Fact is that this can easily be disproven. The Old Frisian language developed only in the late first, early second millennium. The Anglo-Saxon language started to develop much earlier.
True, the Frisii were mentioned by Tacitus, but after that the population of the area declined and several other tribes migrated from the east to England, and probably many Frisii travelled with them. Other probably thought that England was too far after all and settled in the region. Of course the Frisii were related to these other tribes and their linguistic kinship was only reinforced during this period of migrations, but the truth is that nobody knows what language the Frisii spoke, which parts of it still have been preserved, how numerous the Frisii were and who is and who isn't a descendant of the Frisii.
Another example which comes to my mind is the tale of Friso, Saxo and Bruno which moved from India and split up in Europe to form different tribes.
Like any other Frisian does, I do find much pleasure every now and then in imagining these stories to be true, but except for proud, Frisians are also realists and when we're presented with the facts there's nothing we can do, but accept them.
The paper has not been tested and even if it is copied recently that is not suprising because it says it has been copied once anyway, it would have been copied over time as the paper got old or wore out. I think that probably Auntie copied this version but that doesn't make it fake.
I should have added, Welcome to UM and thanks for joining in here!
Edited by The Puzzler, 31 October 2010 - 03:46 AM.