Gero
Gero I (c. 900 – 20 May 965), called the Great (Latin magnus), ruled an initially modest march centred on Merseburg, which he expanded into a vast territory named after him: the marca Geronis. During the mid-10th century, he was the leader of the Saxon Drang nach Osten.
Read more about Gero: Succession and Early Conflicts, Slav Campaigns, Relationship With Church and Family, Death and Division of Territory