Gero the Great, Saxon ruler (b.c. 900)
Gero I (c. 900 – 20 May 965), sometimes called the Great (Latin: magnus), was a German nobleman who ruled an initially modest march centred on Merseburg in the south of the present German state of Saxony-Anhalt, 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 Ostsiedlung.