Gero
Gero I ( 900 – 20 May 965), sometimes called the Great (), 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''. Provided by Wikipedia-
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