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).
In Heraldry terms, The Arrondi is a “slanted” or “tilted” Cross - which normally takes up the entirety of The Shield. The design is used to give the appearance of The Cross “bulging” outward.