Jisho

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Wikipedia definition
1. GeroGero 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 “Gero” on English Wikipedia
Read “ゲロ (オストマルク)” on Japanese Wikipedia
Read “Gero” on DBpedia

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