He negotiated for one of his sons to marry the Byzantine princess Theophano, and he divided Mecklenburg between two margravates.  At the behest of Pope John XII, he invaded It
He negotiated for one of his sons to marry the Byzantine princess Theophano, and he divided Mecklenburg between two margravates.  At the behest of Pope John XII, he invaded Italy and deposed Adalbert, after which he was crowned in St. Peter's. He had earlier thwarted Berengar, the king of Burgundy, by venturing into Italy a year before his coronation and marrying Adelaide, though he was drawn back to his homeland to put down a revolt by the Duke of Lotharingia, Conrad. His chronicler, Thetimar, claimed this man would rather "die than tolerate [the] evil" of the Magyars, whom he defeated in 955 at Lechfeld.  FTP, name this son of Matilda and Henry the Fowler, the first Saxon ruler of the Holy Roman Empire.
He negotiated for one of his sons to marry the Byzantine princess Theophano, and he divided Mecklenburg between two margravates.  
Otto I (or Otto the Great)