In response to a suggestion by @Spiritual Sausage , I decided to start a thread specifically for flags, coats-of-arms, and emblems of various sorts for movements, proposed national entities, etc which for whatever reason, never came to pass... I'll kick it off with this one, a revival of the concept of the Polish-Lithuanian-Ruthenian idea 1st proposed by the Treaty of Hadiach, which was revived by Polish revolutionaries in the 1800's: