He wrote 37 books and treatises, most of which have been published.
He also wrote a small treatise on the Italian language.
If, in fact, anyone did write such a treatise, it's a good thing that no one paid any attention.
He also wrote several treatises on minority rights and international relations.
He served the king for the next 11 years, even writing a military treatise in Korean.
He also wrote several treatises on preservation of the voice and singing well in old age.
In the same year he wrote a treatise against drunkenness.
He wrote a treatise on martial arts, published in 1711.
If a man cannot find love, he must write a psychological treatise on passion.
In this period he wrote numerous treatises on military technique.