For ten points, identify this son of Henry the Fowler, the victor at the Battle of Lechfeld over the Magyars, the first Holy Roman Emperor.
This man arranged a marriage between his son and Theophano, and granted the Duchy of Spoleto to Pandulf Ironhead. This man appointed William of Mainz to oversee the construction of a Pontifical Book. He was captured at Mainz, and this man stripped power from Conrad and Luitdolf and had his authority restored at the Diet of Auerstadt. This ruler, who defeated Berengar of Ivrea, was also the victor at Reckntiz and Andernach. This man was the brother of the Archbishop of Cologne, and he invaded Italy on the request of Adelaide of Italy, later marrying her and taking the title King of Lombardy. For ten points, identify this son of Henry the Fowler, the victor at the Battle of Lechfeld over the Magyars, the first Holy Roman Emperor.
This man arranged a marriage between his son and Theophano, and granted the Duchy of Spoleto to Pandulf Ironhead.
{Otto I} (accept {Otto the Great} before mention; prompt after)