Please excuse my use of English for this post, my high school Spanish is quite bad.
Pietro Monte's Collectanea (1509) has been located, and includes a section for two handed sword. I know that there is an English translation effort ongoing. If you are interested in getting a hold of the text, contact Steve Hick. http://hemaalliance.com/discussion/memberlist.php?mode=viewprofile&u=736
While it is mainly Destreza focused, the Destreza.us forum (http://destreza.us/forum/
) is where pretty much all of the US Iberian tradition researchers are communicating. If you ask this question there, there may be more information I'm unaware of.
As to why there seem to be no Iberian longsword tradition texts, we know:
1) We know that there was a vulgar fencing tradition before Destreza.
2) From Monte, we know that that tradition included longsword (montante) as a foundational weapon at some point.
3) Even into the Destreza period the Montante was the symbol of the Spanish fencing master. This implies that it was held in some high regard, even after Destreza became the dominant form.
4) Pacheco's attacks on vulgar fencing may have caused some of the older texts to be destroyed (we're not sure).
5) There are references to earlier texts, but they have not been rediscovered yet (if they exist at all).
In conclusion, they may still be hiding in some of the great Spanish and Portuguese libraries (like the Collectanea was), or they may have been destroyed. There certainly were texts before Destreza, we just don't have that many of them now.
Jess, that the Italian and German traditions are the best documented (and rediscovered), I think it's a bit premature to say that only the Italians and Germans had longsword traditions. There are both English and Spanish texts that deal with these weapons. That the Italian and German traditions are the best documented is without question, but to say that they are the only
traditions is a bit of the stretch.