With the installment of Byzantine Emperor Kantakouzenos, The Byzantine Civil War begins. Lasting until 1347, his ascension was questioned by so-call “Pretender”, John V. Losing thousands of men and territory, Kantakouzenos will be allowed to retire to a Monastery (and live out the remainder of his life).
Considered an early Heraldic styles, Dimidation involved the impalement of 1 image (on The Dexter), with another. Causing very “colorful and creative” results, the practice died out by the late 14th Century.