I finally got around to checking out something that had been bugging me about that Agave that Diego was using.
Since it was presumably introduced from Mexico, ie. after the Spanish conquest, it would not be appropriate for the ultra conservative Roman period reenactment types
There is a nice site on the plant species in the Balearic Islands here:
http://herbarivirtual.uib.es/eng-ub/especie/4558.htmlAmongst other things it has lookup by Spanish and Catalan common names. Perhaps it might help with identifying the other fibers seen in the video? Hondero mentioned he knew the common name for one of those plants.
I wish I knew what he did to prepare that leaf to pull out such nice clean fiber, it worked a whole lot better than when I did it.