wikiwand references citing highlanders by fitzroy maclean, if you are interested in it maybe pick it up? also in the large sword world, there are useable greatswords and "bearing swords" which were ceremonial giant swords use for special occasions as basically decoration. it is hard to say exactly where the line is because its probably blurs a bit as different people have different limits and few have experience using greatswords. i personally think 22pounds or 10kg is in the realm of bearing swords, but i wasnt there i don *know*.