Byleth and Ferdinand celebrated their marriage with a lavish wedding, but almost immediately afterward, the battle with those who slither in the dark began in earnest. After being named Duke Aegir, Ferdinand overcame a slew of obstacles to help House Hrym and his family's territory recover. At the same time, he fought alongside his spouse for a true, lasting peace in Fodlan. History books extol Ferdinand's success as a lord of his territories, but they do not make mention of the hard-fought battles he endured alongside his wife. Thus, half of his life's work is lost to time.